Should heavy stuff be at the bottom or top of rucksack?
There are proper ways to organize a bag's contents. A general rule of thumb is that the heaviest items should go against your back and around the center of your back. Light items go further from your back. Light items that you don't need regular access to go at the bottom.
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How to Pack a Backpack (How to Make It All Fit!)
Bottom – Midweight items.
Middle back – Heaviest items.
Front – Lightest items.
Top – Lighter items that you may need access to quickly.
Pack Weight for Backpacking and HikingA loaded backpacking pack should not weigh more than about 20 percent of your body weight. (If you weigh 150 pounds, your pack should not exceed 30 pounds for backpacking.) A loaded day hiking pack should not weigh more than about 10 percent of your body weight.
If you're just getting into backpacking, one rule of thumb is to keep the weight of your first backpacking tent under 2.5 to 3 pounds per person. It can be lower than that, but that's a good upper limit to shoot for and one that's still relatively easy to carry in a backpack.
Ventilated backpacks have suspended mesh back panels to help dry perspiration when you're carrying a backpack. The mesh is suspended above a concave cavity so there's a big air space behind your back to help evaporate moisture.