I've only tried zip together bags a few times but that was enough. It doesn't really work for me. My other half doesn't do cold weather camping any more so if the weather's anything other than scorchio I just chose whatever single bag works best for me.
On the odd occasion when it is warm enough to tempt her out we've often abandoned sleeping bags and used a cheap double bed size duvet. Down(ish)ones aren't that expensive (compared to two sleeping bags anyway) I think the one we use at the moment came from Ikea. If you're too hot you can kick it off and if we're not too hot the chances are I'd be on my own anyway.
The err... down side is that you have to be quite brutal to compress it small enough to fit it onto a bike and we could never do that with the synthetic fill one we originally tried. It wasn't a problem in a car and we used it for car camping a few times before trying a bike trip but it needed a down (or feathers or whatever they put in it) one for that. We just use the regular inflatable mats underneath.
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