Originally Posted by
andrewclaus
It depends on the length and scope of the tour, as well as your relationship. If it's a long adventure, and there's a chance one partner may need to cancel or opt out and the other may wish to carry on with the other's support, don't carry double bedding. This has happened on multi-month trips my wife and I have taken over the years.
Good advice. Having split sleeping setups increases redundancy. That does mean added weight, but it also means if one of you gets lost / drops from the ride etc you still have a sleeping setup. If you're already sharing other essential gear between bikes (tents, food, water, cooking supplies) then sharing you sleeping setup is an option to up the coziness and decrease weight.
My SO and I have a very nice (and yes, very expensive joint Xmas gift) 2-person quilt we use for 3-season backpacking. At 1.7lbs it is less than many good single-person sleeping bags. We each have our own sleeping mat underneath based on our own sleeping preferences. We've found that we didn't need a bag rated for as low of temps because of the extra body warmth.
It works for us, saves a few lbs in gear weight and makes for a cozier time. Frankly on a bike tour another 2 or 3lbs bothers me less than it does backpacking. So as with all camping sleep related things, YMMV.