If your ultralight pack gets kicked around like a stray dog, buy this Rottweiler. The tough-skinned Endeavor Summit is made with VX07 sailcloth, which is incredibly abrasion- and tear-resistant for the weight. (For the price, the bottom should be similarly reinforced.) The stiff single-stay-and-framesheet suspension is mated to low-bulk padding for a back-hugging, stable carry with moderate loads. Climber-oriented features like ice-ax attachments (the smartest we've seen) and hipbelt gear loops make this a good choice for summer trips up peaks like Rainier and Shasta. Our minimalists liked the simple top-load compartment, but organizers lamented the lack of storage options. 3.2 lbs, 3,100 cu in; www.jansport.comBonus: The detachable lid converts into a daypack.Bummer: The quick-release buckles are hard to operate in cold weather, especially with gloved hands.