The key to the Altra’s carrying comfort is the C2 back system, a low profile suspension sheet keeps the centre of gravity close to your back and transfers the weight efficiently onto the hips. It’s simple, uncluttered and highly efficient. Combine this with the fully adjustable Gridlock shoulder straps and the Load Transfer Disc hip belt and you have the ultimate carrying system. Gridlock allows you to completely remove and independently adjust the straps horizontally and vertically to get a completely customised fit. Load Transfer Disc lets the padded hip belt pivot as you walk allowing unrestricted movement and ultra efficient load transfer. The hip belt can also be completely removed for travel security and cleaning. The Altra has a pear shape design which helps to keep the pack load low and close to your back minimising load movement and backward pull for ultra efficient carrying. A high density polyethylene foam back panel provides comfort and support, aided by twin aluminium M stays for structural integrity. Shoulder straps use Hypercell foam, an open structure polyurethane foam that provides structure and comfort. All the fabrics on the Altra are rip stop nylon with higher density weaves on abrasion areas. All the fabric is silicone coated to repel water and dirt and then backed with PU for additional protection and strength. One of the best features of the Altra is the Wingman hip pockets, angled perfectly to allow easy access whilst carrying the pack they will accommodate 1 litre water bottles and anything else you need instant access to. An external kangaroo pocket, basically a large bellow front pocket with zipped access and a top compression strap, will swallow extra kit and then compress down when not required. Access to the main compartment can be either through the top lid or via the ingenious U Zip. It acts as quick access on either side, or by unclipping the bottom flap; you can completely unzip the whole bag to get massive access to all your kit. Poles can be attached using the compression straps and ice axes are easily stored and removed using the P’ax one handed axe attachment system. Basically you can remove an ice axe without taking off the pack by simply reaching round and drawing the axe downwards to release it.