Mammut Trion Light 28 Backpack - 1708cu in

Cool green color on this very versatile pack. Nice waterproofing ability and removable features adds to super functionality.

i love this backpack it is great for climbing and day hikes it has a removable waterproof liner

This is an excellent pack for alpine use -- cleverly designed, highly adjustable, and very comfortable with loads up to mid-20 lbs. I most often use it for overnight summit attempts on peaks to 14,000 ft, and strip it down to a minimum for actual summiting. On return to camp, it can be restored in a matter of minutes to a load-bearing, weatherproof sack for gear hauling to the car. I most often use it without the internal liner (which zips out) or top lid for dry-day climbs and scrambles in the alpine zone. The green color is not my favorite, but it makes one highly visible during hunting season (this is a major benefit where I live). I love the single buckle attachment for the top flap, since there is an internal rope strap for carrying the coil. The ice axe attachments are also fine, though I prefer better positioning of the bottom loops for a general mountain axe like the BD Raven; they will work very well for curved ice tools of short shaft length. The ski tote straps are also adequate, particularly for A-framing. The material is very tough, flexible, and light. In short, the elegance of this pack's highly functional design makes me wonder why so many alpine packs continue to over-engineer their features. If you like a light, functional, and highly versatile alpine pack for day or overnight summit attempts, THIS IS IT. Well done, Mammut!

Really the only pack I've found is waterproof. Using the removable inner dy bag its totally waterproof and I used it on a two day very rainy trip and my syff stayed dry. Great design and very light especially when you strip off the non essentail stuff. Seems very tough as well.