Another popular choice is to buy two Cat's Meow bags from The North Face ($169; www.thenorthface.com) with opposing left and right zippers so you can zip the pair together. That would be a very warm setupthe synthetic-fill Cat's Meow is rated to 20 degreesbut is also somewhat bulky and heavy (about six pounds total). For that matter, just about any maker's bags are mateable if purchased with opposite zipper configurations. And for a setup similar to what you can get from Feathered Friends, take a look at the Marmot Wasatch ($199; www.marmot.com), a 25-degree, semi-rectangular bag that mates with a second Wasatch or unzips and lies flat as a comforter.
For any double-bag system, get yourselves a Couple Kit from Cascade Designs ($7; www.cascadedesigns.com), a set of paired loops that holds two pads together, so that you don't end up with a big gap on the ground between the two of you.
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