If necessity is the mother of invention, then it’s clear how Cam Brensinger managed to design the best new tent of 2005. Seven years ago, overcome by altitude sickness while attempting to scale Alaska’s fearsome Denali peak, Brensinger was forced to take refuge in a small, flimsy tent for three days while he waited out a storm alone. Unimpressed by the quality of his equipment, which was difficult to set up and maintain, Brensinger founded New Hampshire-based Nemo Equipment in 2002 to design a better shelter. Last May the startup introduced the world’s first inflatable backcountry tent, the Nemo Hypno. An innovative pump and a series of air ducts inflate the lightweight but sturdy structure in just 30 seconds. At 3.7 pounds, the $455 Hypno is highly portable, requiring none of the usual tent poles. Brensinger’s invention has attracted the attention of campingcrazed angel investors, with whom he is currently negotiating a round of funding.

BOTTOM LINE: After nearly selling out his entire inventory in 2005, Brensinger plans to triple production next year. Previously available only through Nemo’s site, the Hypno will soon be stocked by retail stores across the country, including the Eastern Mountain Sports chain.