The 20% rule for backpacking is a general guideline suggesting that your fully loaded backpack should weigh no more than approximately 20% of your body weight. For example, if you weigh 150 pounds (68 kg), the guideline suggests carrying around 30 pounds (13.6 kg) or less. However, this is a starting point rather than a strict safety rule. Your fitness, hiking experience, terrain, trip length, and individual physical needs all affect how much weight you can comfortably carry.
Backpacking is one of the most rewarding ways to explore the outdoors.
You get to carry everything you need, travel through beautiful landscapes, and spend time away from the distractions of everyday life.
But there's one challenge almost every backpacker encounters.
How much should your backpack weigh?
Pack too little, and you might leave behind something important.
Pack too much, and even a relatively easy trail can become exhausting.
That's where the 20% rule comes in.
It's a simple guideline that helps backpackers estimate a reasonable starting weight for their packs.
However, there's more to comfortable backpacking than calculating a percentage of your body weight.
Let's explore what the rule means, how to use it, and when you might need to adjust it.
The Short Answer
The 20% rule suggests keeping your loaded backpack at or below approximately one-fifth of your body weight.
For example:
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If you weigh 100 pounds, 20% is 20 pounds.
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If you weigh 120 pounds, 20% is 24 pounds.
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If you weigh 140 pounds, 20% is 28 pounds.
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If you weigh 150 pounds, 20% is 30 pounds.
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If you weigh 160 pounds, 20% is 32 pounds.
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If you weigh 180 pounds, 20% is 36 pounds.
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If you weigh 200 pounds, 20% is 40 pounds.
These figures are examples, not personalized carrying recommendations.
The guideline generally refers to the total weight of your loaded backpack, including the backpack itself, shelter, clothing, food, water, and other equipment.
It's often used as a rough planning benchmark for overnight or multiday backpacking.
For ordinary day hiking, a commonly mentioned guideline is closer to 10% of body weight, although that isn't a universal rule either.
1. Why Is It Called the 20% Rule?
The name comes directly from the calculation.
Twenty percent is one-fifth of your body weight.
To estimate your backpack weight using the rule, multiply your body weight by 0.20.
For example, imagine you weigh 170 pounds.
Your calculation would be:
170 × 0.20 = 34 pounds
That means the guideline suggests a loaded backpack weight of approximately 34 pounds or less.
You can use the same calculation with kilograms.
If you weigh 70 kilograms:
70 × 0.20 = 14 kilograms
The result is a rough reference point for planning.
It doesn't mean that carrying 14 kilograms is automatically comfortable or safe for every person who weighs 70 kilograms.
And it doesn't mean that exceeding 20% will necessarily cause an injury.
The rule is a simple estimate, not an individualized assessment of carrying capacity.
2. Why Does Backpack Weight Matter?
A heavy backpack changes how your body moves.
When you're carrying extra weight, your muscles and joints must work harder with every step.
This can become particularly noticeable on long hikes.
You may experience:
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Greater fatigue
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Increased effort on uphill sections
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More pressure on your feet
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Shoulder discomfort
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Hip discomfort
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Changes in balance
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Reduced walking speed
A heavy pack can also make uneven terrain more challenging.
For example, stepping across rocks or descending a steep trail may require more control when you're carrying substantial weight.
This doesn't mean every heavy backpack is dangerous.
Experienced backpackers sometimes carry heavier loads when their trips require additional food, water, or specialized equipment.
But unnecessary weight can make hiking less enjoyable.
That's why it's worth paying attention to what you pack.
3. Does the 20% Rule Include Food and Water?
Yes.
When applying the 20% guideline, you should generally count everything you're carrying inside or attached to your backpack.
That includes:
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Backpack
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Tent or shelter
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Sleeping bag
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Sleeping pad
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Clothing
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Food
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Water
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Cooking equipment
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First aid supplies
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Navigation equipment
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Personal items
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Other necessary gear
This is an important distinction because backpackers often discuss different types of pack weight.
Base weight usually refers to the weight of your backpack and equipment without consumables such as food, water, and fuel.
Total pack weight includes those consumables.
The 20% guideline is generally applied to total loaded pack weight.
For example, your backpack might have a base weight of 18 pounds.
After adding food, water, and fuel, it might weigh 27 pounds.
For the 20% calculation, you would use 27 pounds.
4. Is the 20% Rule Suitable for Beginners?
It can be a useful starting point, but beginners may find a lighter pack more comfortable.
If you're new to backpacking, your body may not be accustomed to carrying a loaded pack for several hours.
You may also be learning how to:
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Adjust backpack straps
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Distribute equipment weight
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Walk comfortably on uneven ground
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Manage uphill and downhill sections
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Pace yourself over longer distances
Starting with a lighter load can make these skills easier to develop.
For example, if the 20% calculation gives you a suggested weight of 30 pounds, that doesn't mean you need to carry 30 pounds.
You may find 20 or 25 pounds more comfortable, provided you still have everything necessary for a safe trip.
The 20% rule is not a target you need to reach.
It's better understood as a rough upper planning reference that may need to be adjusted.
5. Is 20% of Your Body Weight Too Heavy for Backpacking?
For some people, yes.
Twenty percent can be a substantial load, particularly during long hikes or on difficult terrain.
A person who is comfortable carrying that weight on a flat trail may struggle with the same backpack during a steep mountain climb.
Your comfortable carrying weight depends on several factors.
These include:
Fitness: Your current strength and endurance affect how you respond to a loaded backpack.
Experience: Familiarity with backpacking can help you manage equipment and pace more effectively.
Terrain: Steep, rocky, muddy, or uneven trails can make a load feel more demanding.
Distance: Carrying weight for two hours is different from carrying it for an entire day.
Weather: Heat, cold, wind, and rain can increase the demands of a hike.
Individual needs: Previous injuries, joint problems, balance limitations, and other health considerations may affect what you can carry comfortably.
A lighter pack may be appropriate even if you're physically fit.
There's no benefit in carrying unnecessary weight simply because a general rule says you can.
6. How Much Should a Backpack Weigh for a Day Hike?
Day hiking usually requires less equipment than overnight backpacking.
You typically don't need to carry a tent, sleeping bag, or full cooking setup.
That means your backpack can often be much lighter.
A commonly mentioned guideline is to keep a daypack around 10% of your body weight or less.
For someone weighing 150 pounds, that would be approximately 15 pounds.
However, the right weight depends on the hike.
A short walk on a maintained trail in mild weather may require relatively little equipment.
A remote mountain hike may require additional clothing, water, food, navigation tools, and emergency supplies.
Always prioritize essential safety equipment over meeting an arbitrary weight percentage.
A light backpack isn't helpful if you've removed something important for the conditions.
7. How Much Should a Backpack Weigh for an Overnight Trip?
Overnight backpacking usually involves carrying more equipment.
Depending on your plans, you may need:
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Shelter
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Sleeping system
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Food
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Water
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Cooking supplies
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Additional clothing
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Personal hygiene items
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Safety equipment
This is where the 20% guideline is often discussed.
For example, a person weighing 160 pounds might use 32 pounds as a rough reference.
But that doesn't mean 32 pounds is the ideal pack weight.
A well-planned overnight trip may require considerably less.
On the other hand, cold conditions, long water carries, or specialized equipment may make a heavier load unavoidable.
The best approach is to calculate what you genuinely need, weigh your equipment, and test the loaded backpack before leaving.
8. Does Backpack Weight Affect Hiking Speed?
Yes, carrying more weight can affect how quickly and comfortably you move.
A heavier backpack generally increases the physical effort required for walking.
You may notice the difference most clearly when:
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Climbing hills
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Walking on uneven terrain
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Hiking for several hours
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Crossing obstacles
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Descending steep trails
The exact effect varies between individuals.
Some experienced backpackers can maintain a steady pace with relatively heavy loads.
Others may need more frequent breaks.
Rather than trying to maintain a particular speed, choose a sustainable pace.
If your backpack causes you to become exhausted much earlier than expected, it may be too heavy for your current ability or route.
9. How Can You Make Your Backpack Lighter?
One of the easiest ways to improve backpacking comfort is to remove unnecessary weight.
You don't necessarily need to buy expensive ultralight equipment.
Start by reviewing what you're carrying.
Ask yourself whether each item is necessary for the trip.
Some practical ways to reduce weight include:
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Avoiding duplicate clothing
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Packing appropriate quantities of food
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Planning water refills where reliable sources are available
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Choosing equipment suited to the weather
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Sharing suitable group equipment
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Removing unnecessary packaging
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Leaving behind nonessential accessories
Be careful not to remove important safety items simply to achieve a lighter number.
For example, leaving your rain protection behind before a wet mountain hike would be a poor trade-off.
The goal is to eliminate unnecessary weight while keeping the equipment you need.
10. Does Backpack Fit Matter More Than Weight?
Both matter.
A lighter backpack that fits badly can still cause discomfort.
And a heavier backpack that fits well may feel more manageable than one with poorly adjusted straps.
A properly fitted backpack should suit your torso length and body shape.
For packs designed with load-bearing hip belts, the hip belt should transfer an appropriate share of the load to your hips.
The shoulder straps should help stabilize the backpack without creating excessive pressure.
Other features may include:
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Adjustable shoulder straps
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Sternum strap
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Load lifters
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Padded hip belt
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Appropriate back-panel length
Not every backpack includes all these features.
Smaller daypacks may have simpler designs.
For longer backpacking trips, however, fit becomes especially important.
Helpful tip: Try on a backpack with weight inside it.
An empty backpack may feel comfortable in a shop but behave differently once fully loaded.
11. How Should You Distribute Weight Inside Your Backpack?
How you pack your equipment can influence balance and comfort.
A common approach is to place relatively heavy, dense items close to your back and around the middle of the pack.
This helps keep the load near your body's center of mass.
Lighter or bulkier items can often go toward the bottom or outer sections.
Frequently used items should remain accessible.
For example:
Bottom of the pack: Sleeping bag or other bulky items you won't need until camp.
Middle of the pack: Dense equipment positioned close to your back.
Upper sections: Clothing or supplies you may need during the day.
Accessible pockets: Water, snacks, navigation tools, and other frequently used essentials.
Exact packing arrangements vary depending on backpack design and terrain.
The goal is to keep the load stable and prevent items from shifting while you walk.
Avoid placing heavy equipment far from your back if it causes the pack to pull backward.
12. Practice Carrying Your Backpack Before a Long Hike
If you're planning your first overnight backpacking trip, practice is one of the most useful things you can do.
Don't wait until the actual hike to discover how a loaded backpack feels.
Start with shorter walks.
Carry a manageable amount of weight.
Then gradually increase the distance or load as your comfort and conditioning improve.
You can also practice walking on hills and stairs.
Pay attention to:
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Shoulder pressure
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Hip-belt comfort
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Foot discomfort
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Balance
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Walking pace
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General fatigue
If something feels wrong, adjust your equipment.
Persistent pain isn't something you should simply ignore.
Practicing with your backpack helps you understand your own comfortable carrying weight rather than relying entirely on a percentage.
What Is the Difference Between the 10% and 20% Backpack Rules?
The two guidelines are commonly associated with different types of hiking.
The 10% rule is often mentioned for day hiking, when you're carrying a smaller selection of equipment.
The 20% rule is often mentioned for overnight or multiday backpacking, when you may need shelter, sleeping equipment, food, and other supplies.
However, neither percentage is a scientifically established limit that applies equally to everyone.
A day hiker may need to carry more than 10% in certain conditions.
An overnight backpacker may be more comfortable carrying much less than 20%.
Treat both guidelines as planning references rather than strict rules.
Is It Better to Carry a Lighter Backpack?
Generally, reducing unnecessary pack weight can make hiking more comfortable.
A lighter load may help you move more easily, reduce fatigue, and manage challenging terrain.
But lighter isn't automatically better if it means leaving behind necessary equipment.
For example, an ultralight backpacking setup may work well for an experienced hiker in suitable conditions.
The same equipment selection might be inappropriate for a beginner heading into cold, remote mountain terrain.
A sensible backpacking setup balances:
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Weight
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Comfort
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Safety
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Weather protection
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Durability
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Personal needs
The ideal backpack isn't necessarily the lightest possible one.
It's the lightest practical setup that still meets the requirements of your trip.
Can You Carry More Than 20% of Your Body Weight?
Yes, some people carry more than 20% of their body weight.
Long expeditions, extended food carries, and certain specialized trips may require heavier loads.
Experienced backpackers may also have the conditioning and equipment needed to manage additional weight.
However, exceeding the guideline increases the importance of careful preparation.
A heavier load can make hiking more physically demanding and may affect balance, fatigue, and comfort.
If you need to carry substantial weight, build up gradually and consider whether the route, distance, and conditions are appropriate for your abilities.
People with relevant injuries or health concerns may benefit from individualized guidance before attempting heavy-load backpacking.
What Is a Good Backpack Weight for a Beginner?
A good beginner backpack weight is one that allows you to walk comfortably while carrying all the equipment necessary for your trip.
That may be significantly less than 20% of your body weight.
Start by choosing an appropriate route.
Then make a realistic packing list.
Weigh your equipment, including food and water.
Try the loaded pack on a practice walk.
If the weight feels excessive, look for unnecessary items you can remove.
Don't begin by choosing a target weight and then filling your backpack until you reach it.
Instead, pack what you need and aim to keep the load manageable.
A Quick Aside About Backpacking Comfort
One thing worth remembering is that backpacking isn't a competition to see who can carry the most weight.
A heavy backpack doesn't automatically make you a more experienced hiker.
And a lightweight backpack doesn't automatically mean you're better prepared.
What matters is whether your equipment suits the trip.
A short overnight hike in mild weather may allow a relatively simple setup.
A remote mountain expedition may require additional equipment and supplies.
Both situations can involve thoughtful packing.
The goal is to carry what you need without making the experience unnecessarily difficult.
If your backpack feels uncomfortable during a practice hike, that's useful information.
Adjust the fit.
Review your equipment.
And make changes before heading into more demanding terrain.
My Personal Takeaway
The 20% rule for backpacking is a simple guideline suggesting that your fully loaded backpack should weigh no more than approximately one-fifth of your body weight.
For someone weighing 150 pounds, that works out to around 30 pounds.
For someone weighing 70 kilograms, it's approximately 14 kilograms.
But 20% isn't a universal safe limit or a weight you should aim to carry.
Some hikers will be more comfortable with considerably less.
Others may need to carry more because of their trip requirements.
If you're a beginner, focus on keeping your pack manageable, choosing suitable equipment, and practicing with the loaded backpack before your trip.
Make sure the pack fits properly.
Distribute weight carefully.
Avoid unnecessary items.
And never sacrifice essential safety equipment just to meet a percentage.
Ultimately, the best backpack weight is the one that allows you to hike comfortably, stay adequately prepared, and enjoy the journey without carrying more than you reasonably need.