Best pack i've ever seen - Osprey Xenith 75 Pack

Capacity: 75 litres.
AirScape backpanel uses mesh and foam ridges to allow air to pass through keeping you cool and comfortable.
Adjustable back length allows you to get the correct distance between the hip belt and shoulder straps to evenly distribute the weight.
Lightweight peripheral frame.
Bioform CM hipbelt has been precurved to improve the fit with a heavy load. The foam can be custom moulded within a store with the appropriate machine.
Top lid access to the main compartment.
The top lid is removable and contains an accessory pocket at the back and an internal mesh compartment.
FlapJacket cover secure the top of the bag when the lid is removed.
Split base compartment with a separate zipped entry.
Long side zip entry on either side to the main compartment.
Compatible with a hydration bladder.
Adjustable hipbelt with an easy to use forward pull.
Zipped pockets on the hipbelt are ideal for storing snacks whilst on the move.
Internal clip for keys.
Two small zipped pockets on the front.
Removable straps at the base to store a sleeping mat.
Stow-on-the-Go attachment loops for a pair of trekking poles.
Large stretch mesh pocket on the front to stash items.
Stretch mesh side pocket for store a water bottle.
Compression straps on the side stabilise your gear within the bag.
Attachment loops on the front to secure an ice axe.
Adjustable chest straps with a built in emergency whistle.