Quick answer: There is no agency rule. REI defines a daypack as roughly 40 liters or about 30 pounds or less, and says a well-loaded backpacking pack feels balanced on the hips and does not shift or sway. Many hikers aim lower than 30 pounds for comfort, but the honest answer is that the number depends on your fitness, trip and gear.
You will see rules like 20 percent of body weight repeated online. The sources we reviewed do not state one, so this guide gives what REI does say and a way to decide.
Weight is the thing you control most, after the pack itself.
Related: tent camping gear checklist, packing for balance and weekend pack size.
What REI Says
| Figure | Context |
|---|---|
| About 30 lb or less | What counts as a daypack load |
| About 15 lb | Load at which a hipbelt starts to matter |
| Balanced on hips, no sway | REI test for a well-loaded backpacking pack |
A Way to Decide Your Limit
- Weigh the pack fully loaded with water and food.
- Walk a few miles with it. If your shoulders ache, re-fit the hipbelt first.
- If your legs or feet are the limit, cut weight: food, water carried, and duplicate gear.
- Record the weight that felt fine, and plan around it.
Where Weight Hides
Water is heaviest; carry what you need to the next source. Food for extra days, a second set of clothes and large cook kits add up. REI advises keeping dense items close to your back and centered, which does not cut weight but makes it carry better.
Honest Limits
We found no agency or REI figure for a maximum pack weight or a percentage of body weight, so any such rule you see is a convention. Your body and trip decide.
Frequently Asked Questions
Is there a rule for backpack weight?
Not from the sources we reviewed. REI gives context figures only.
What is a daypack load?
About 30 lb or less, per REI.
Is 30 lb heavy for backpacking?
It is common. Comfort depends on fit and fitness.
Does the 20 percent rule come from anywhere?
We could not source it. Treat it as a convention.
How do I reduce weight?
Water, food, duplicate clothing, cook kit.
Where should heavy items go?
Close to the back and centered.
Why do my shoulders hurt?
The hipbelt is not carrying the load. Re-fit it.
How much does water weigh?
About 2.2 lb per liter.
Should kids carry less?
Yes, and the sources do not give a figure.
Does a lighter pack help?
Pack weight is part of base weight; cutting it helps.
Bottom Line
No fixed rule exists in the sources; a daypack is about 30 lb or less and a backpacking load should ride on the hips.
Weigh it, walk it and trim what hurt.
Sources: REI, How to Choose Daypacks; REI, How to Pack a Backpack; REI, How to Choose a Backpack.