We’re called Feathered Friends for a reason! No matter who you are, we have a couple’s solution for you. The most efficient (and comfortable) way to share warmth is always to use a sleep system designed to accommodate two people. If you’d prefer a little more space and luxury, we offer both a rectangular (the Condor) and a semi-rectangular (the Penguin) sleeping bag, each of which can be used alone, or zipped into a corresponding groundsheet with sleeves to keep two standard sleeping pads in place and two zip-on hoods to form a two-person sleep system. We also offer a hybrid sleeping bag/quilt called the Flicker, which can be fully zipped into another Flicker to create an enclosed version of the quilt that will accommodate two people. If weight is your primary concern, the highly specialized Spoonbill makes for an efficient fast-and-light setup and is the preferred choice for alpine adventures. In an emergency, two mummy-style sleeping bags can be zipped together to conserve warmth, but the resulting system is rarely heat efficient -- and even more rarely comfortable. If you have experience zipping two mummy bags together and would like to ensure that your and your partner’s bags will zip together, just be sure that one carries a left-hand side zipper (standard on all men’s/unisex bags), and the other carries a right-hand side zipper (standard on all women-specific bags); zipper gauge is universal across all models except the Flicker series, which uses a smaller zip.