Mountain Hardwear 2nd Dimension - Long Sleeping Bag (Closeout):
Unless you're heading up a well-sponsored expedition, you probably don't intend on buying a sleeping bag for one specific application in one type of climate. Ideally you need a roundish-square peg of multifunctionality that slides perfectly into place for wherever or whatever you need it. That's why Mountain Hard Wear designed the highly functional 2nd Dimension bag. It's part of the innovative Quantum series, a selection of bags equipped with an expandable draft tube so you can add up to 8 inches of cool space to sleep comfortably in the summer heat or stuff in additional layers when the mercury does the limbo. Using the 15F rating as a baseline, you can open the bag up for early-spring and late-fall backpacking or keep it snugly zipped for mountaineering. It's insulated with synthetic Polarguard Delta, a new fill that's 10% lighter than Polarguard 3D.