So, I've had the notion to go on a little trip with a friend. And we need sleeping bags. So instead of us both bringing individual mats and sleeping bags, I thought; 'well surely two sleeping bags takes up far more space, uses far more material and is less insulative than a double sleeping bag!, that way we have the heat of two people sleeping close together, to economise on material and thus weight, seems far more efficient'.

Well anyway, I'm not looking up CHEAP (say 50£) double sleeping bags, and they're like 4kg when a normal bag is like 1kg!!! So why the fuck are double sleeping bags so big and heavy. What is this shit. And why are the only good ones I can get 300£.

And furthermore, if a single bed mattress is 90cm wide, and a double is 138cm wide, then you should be able to get a 'double' roll mat which is wider, but not 2* as wide as a conventional single person roll mat, do these exist? Or will that set me back 200£ as well.