back in the day, my parents did the same sort of thing with two mummy bags (zipping them together). remembering that, i picked up a pair of cat's meow bags a couple weeks ago for the same purpose.
they are very, very easy to link together, and provide plenty of room for two, as long as you are two who sleep like pretzels as opposed to sleeping apart. the bags are very comfortable and compress down slightly larger than a nalgene bottle :Wow1:.
i got the pair rather than a single two-person bag since you never know if youll be out separate or if youll always have the room or environment for a two-person setup side by side, plus both people get foot room, a kenny-style head wrap and a pillow slot. i did compare them to the large, square double sacks, and figured the pair of mummies would pack tighter and be more thermally efficient in cold weather than the doubles, and take up less square footage unpacked.
we linked the bags in moab last weekend with great results...the zipper going down the middle was actually more convenient imho than a side zip, since as the temperature changes each person can cover up as they need--she's always freezing, and i'm usually too warm. it also makes it a lot easier if one person has to get up in the night, or if one of you gets up earlier in the morning. they almost cover a queen-sized air mattress when theyre linked together...probably about the size of a "full".
the zipper down the middle on the bottom didnt present a problem, and the padded tube down the zipper on top is comfy...zipper never catches, and the zipper also never touches your skin (brrr).
it's also cheaper than buying two singles and a double
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since i've been moving around a bit lately ive been sleeping this way for a few days now, the bags are very, very comfortable with two people, as long as you normally sleep like pretzels. not so good for sleeping separate, then youre better off separating the bags.
-sean
