Lost count of how many peaks Ive done with my old mutant. Summer Sierra peaks, winter ones, ice climbing, cragging, light overnighting, its been the best. The size handles kit for a full day in the mountains, but you have to pack this one carefully to make it carry right. I removed the framestay, this makes how you pack it more important but well worth the extra few minutes. Takes a rack, rope, clothes, food, water and 6 beers well. Osprey warrantied me a new one after I sent them my old. Its been up peaks all over California, Wyoming, Nevada, and even Croatia and Slovenia!