40 L Backpacks

A backpack of 40 litres is suitable for a few days' travel and day hikes. This is the capacity where you'll find the load-bearing hip belt and the adjustable back length, two features missing from urban models. It's also the size that many travellers take onboard, provided the backpack is appropriately measured when packed.

The backpack 40 litres, travel and hiking format

Two types of models fall into this capacity. Travel models open completely like a suitcase and hide the straps behind a flap to be stowed away without snagging. Hiking models keep the load accessible from the top, with a water bottle pocket and pole holders. A backpack for hiking 40 litres often weighs more empty than its urban equivalent, thanks to the frame and belt.

What distinguishes a lightweight backpack 40 L

Empty weight is the most critical figure, yet the least frequently checked. An ultra-light 40-litre backpack removes the metal frame, reduces pockets, and replaces thick nylon with a ripstop fabric coating. However, this saving comes at the cost of comfort as soon as the load gets heavy. The empty weight will be on the product sheet, so always compare it between two models of the same capacity.

Adjusting the back and hip belt of a backpack 40 L

A backpack of 40 litres that is badly adjusted can cause pain in the shoulders while the load should rest on the hips. The adjustment order remains the same.

• First, tighten the hip belt around the pelvic bones, with the backpack loaded.
• Then, adjust the straps without squashing the shoulders.
• Fine-tune the load lifters at the top of the straps to bring the backpack closer to your back.
• Finally, fasten the chest strap, it only keeps the straps from separating.

Osprey, VAUDE and Dakine offer backpacks with adjustable back lengths, useful if multiple people share the same backpack.