How to Pack a 40 Liter Backpack | Balance Your Load

Packing a 40 liter backpack well means putting heavy items close to your back and centered, with lighter gear filling the bottom and top.

Getting the load arrangement right matters more than the bag’s size. A 40-liter backpack is a compact travel companion, and every inch counts. The goal is to keep the center of gravity tight against your spine so the pack feels like part of your body, not a swinging burden. Get this wrong and even a light load will ache by mile three.

Here is the packing order that works for most trips, followed by the fit adjustments that make the whole system comfortable.

The Best Packing Order For A 40L Pack

Think of the pack in three vertical zones: bottom, core, and top. Each zone has a job.

• Bottom: your sleeping bag or other soft, compressible items. These are light and squishy, so they fill the awkward curved base without pulling the load backward.
• Against the back and middle: the dense, heavy stuff — tent body, food, water bladder, stove, and cook kit. Keep these items centered and as close to the back panel as possible. This keeps the center of gravity near your spine.
• Top: rain jacket, snacks, first aid kit, and anything you need without stopping. These are light, so they sit above the heavy core without ruining your balance.
• External pockets and straps: sleeping pad, wet items, and frequently needed small tools. Only use these if your pack’s design supports them; lashed-on gear shifts your center of gravity, so keep it minimal.

Heavy items placed low and far from the back pull you backward and strain your shoulders. Conversely, a hard object pressed against your spine can be painful. Keep the dense stuff flat against the back panel and let the soft items buffer the rest.

Adjusting The Fit So The Hipbelt Carries The Load

A pack only works if it fits, and fit is about torso length, not just liters. Before you adjust anything, measure your torso from the C7 vertebra (the bony bump at the base of your neck) to the iliac crest (the top of your hipbones). That measurement, not pack volume, decides the correct frame size.

Once you have the right size, load the pack with real weight before fitting it — MEC recommends about 8–10 kg for a realistic test. Then work through the straps in this order:

1. Hipbelt: Position it so it fully covers your hipbones and the iliac crest, then tighten. It should feel snug without restricting your breathing. This is the main load-bearing strap.
2. Shoulder straps: Tighten them so they lie flat and close to your shoulders. They should stabilize the pack, not carry its weight. If they dig in, the hipbelt is too loose.
3. Load lifters: These top straps should form about a 30–45 degree angle, pulling the top of the pack toward your body without lifting weight off your hips.
4. Sternum strap: Fasten it across your chest to stop the pack swaying side to side, but keep it loose enough for natural breathing.

Getting this sequence right transfers most of the weight to your hips — the strongest part of your frame — and leaves your shoulders free.

Current 40L Models Worth Knowing

Not all 40-liter packs carry the same way. Here’s how a few current models compare on paper:

Notice that the same 40L label hides different shapes and weights. A travel-focused pack like the Osprey Farpoint opens like a suitcase and fits airline overhead bins, while a hiking pack favors a tall, narrow profile for trail balance. Dimensions matter as much as liters, so check width and depth against your airline’s carry-on limits. If you’re weighing the options, our tested roundup of the best 40 liter backpack rucksack options breaks down which model suits which trip.

Common Packing Mistakes That Ruin Comfort

The most frequent errors are easy to spot once you know them:

• Heavy items too low or too far from the back. This pulls your center of gravity away from your body and makes every step a workout.
• Overtightened shoulder straps. If your shoulders ache, the straps are doing the hipbelt’s job. Loosen them and tighten the hipbelt instead.
• Misplaced hipbelt. Wearing it too high or too low lets it miss the iliac crest, and the whole load drops onto your shoulders.
• Ignoring torso length. Buying by volume alone almost guarantees a bad fit. The frame must match your back, not just your gear.

Also avoid packing wet items or hard objects where they can jab your spine or shift your balance. Wet gear goes on the outside or in a waterproof liner at the bottom, and hard-edged items stay buried in the middle of soft layers.