Looking for one bag to handle alpine missions in the summer and trekking adventures in spring and fall' The Crux Torpedo 500 32 Degree Down Sleeping Bag is a superlight, durable, and seriously water resistant bag that just might be your horse. Its crowning feature is a whole mess of ridiculously light and lofty EU 850 fill goose down the American rating, over 900, is pretty much off the down scale, which is packed between a rugged nylon shell and tough Pertex Quantum lining before being finished off by a nearly waterproof eVent 2L breathable membrane. Accordingly, the Torpedo's more ready to sleep under the stars than most bags and can handle inclement mountain weather like no bag you've tried. The Torpedo also comes in a whole series of widths, with various lengths available in each size, so you'll be able to fine tune your fit go smaller if you care about weight, or size up if you're more interested in warmth or breathing room. Either way, the draft tube, adjustable neck baffle, and over chest v tube will keep you extra toasty, while the water resistant Riri Aquazip adds yet another layer of weaterproofing to this killer bag. Crux also includes a cotton storage sack and roll top stuff sack with each bag, so you'll be ready to pack up and go as soon as your plans come together.