Patagonia made the 45L Ascensionist Pack with just the features you need most when you're pushing hard on an ascent. This ultralight pack loves the idea of ice-climbing in Ouray, ascending Aconcagua, or hiking for a week through Glacier National Park. Aluminum offers some structure but can come out when you don't want to fight both your pack and the terrain. Since this high-minded pack only has 1 point of access—the top—you'll want to put less-used items in the bottom. An internal flap draws up over the top and slips under the main collar to create a weather-resistant seal. The center sheath wants to hold your ice axe, no matter the size. Lots of daisy chain lash points give you external storage options when you don't want filthy ropes or mud-crusted crampons inside your bag. If you're only out for the day, use the compression straps to minimize bulk and maximize mobility.