I found a two berth pop-up tent while out walking. It was snagged on a bramble and must have blown away - or possible been abandoned. Being thrifty I folded it up and tied it to my pack, took it home for a good look. It took me 5 minutes to break the single 20ft plus pole, but the dog did have to show me how.
These pop-ups are funny things - more beach shelter than tent. That got me thinking.
If I cut the groundsheet out leaving say 12" attached to the outer, then feed bungy cord throught the pole sleeve at ground level only, the pop-up becomes something very close to a six or eight man bothy bag. And a fair bit lighter weight, It also has two good vents and a double-zip door openable at the top only if required. I just need to round up some chums to try it out - see if it would work in foul weather.
Any way, I'd suggest this to be an excellent improvement should you have a pop-up tent. Throw the pole away and cut the groundsheet out - improves most makes!