Here's what other sites are saying:
The new M4 pack is perfectly profiled for technical alpinism where climbers use the same pack for the approach and the climb. The removable waist belt padding is comfortable on the approach, then strips down to nothing for technical climbing with a harness. The front panel is constructed from tough 600D Ripstop Polyester for strength and durability and the side panels are constructed from lightweight 100D Mini-Ripstop nylon with a waterproof coating for light weight and compressibility. The exclusive Backdoor system allows access to contents of the pack without having to remove everything on top before gaining access to gear at the bottom. Comfort is assured by the ventilated mesh padding on the back, and breathable, ergonomic shoulder straps with load adjustment systems. The waist belt and chest strap feature the exclusive EZ OP buckles which can be opened with one hand; a feature that is especially useful when wearing gloves. Additional technical features include mesh pockets on the waist and shoulder straps, an external helmet carrying system that hides away when not in use, 2 ice axe carriers designed for use with modern tools, holders for trekking poles, lateral ski holders, and rope carrying straps.
It's not very practical to have a designated pack for every activity--a skiing pack, a climbing pack, a trekking pack, and a mountaineering pack--which is why the do-it-all Camp USA M4 Backpack is a multi-sport adventurer's dream. Kitted out with A-frame ski carry, ice axe loops, trekking pole holders, a rope strap, and stow-away helmet carry, it can load up all the gear you need for a day or two of skiing, climbing, or backpacking, and it'll save room in your gear closet when you get back home. The steel wire frame stays support your load comfortably while still flexing, and the ventilated EVA back panel and shoulder straps carry well and help you stay cool. To handle both approaches and technical climbs, Camp USA designed the M4 with a padded waist belt that can be removed to lighten things up for the summit push, and it hooked the waist belt and chest strap up with EZ OP buckles that are easy to work with gloves on. The M4's also compatible with your hydration bladder, so you can keep your gullet moist. It has handy pockets on the waist belt, shoulder straps, and lid to keep your camera, GPS, phone, and snacks easily reachable when you're on the go.
A true mountaineer's pack, CAMP's M4 is a total workhorse. This large-volume pack has 40 liters of room plus a 2-buckle top lid with a zippered pocket. It keeps your gear organized with a hidden helmet carrier, ice axe carriers, A-frame ski carry, rope carry straps, and an included crampon case and is hydration compatible.
- Mountain Gear