Much like the usual worn out counter appliances, kichenware, lamps, accessories, dated decorative knick knacks, hats, shoes, clothes, toys, books, and so on, you can always depend on there being a bin or two full of various purses at your local Goodwill store. Most purses usually cross the line of ridiculous for some reason or another, perhaps they are all picked through and only the crazy odd remain, but you can dig around and occasionally find some perfect purses or bags to bring home to use as sleeping pouches for your sugar gliders. And if you are the type to lug your gliders around all day, well a purse seems right for that task.
I look for the tough cotton types of material such as denim, canvas or duck to help avoid problems with nails.
Used purses are so cheap that you can pick out more than you need, dump them all into the front loader for a cycle or two, removed the straps, internal dangly pockets and other things that get into the way, and hang em in the cage.
Mine love their purses.
I usually hang them on the cage door so that when I open the door, the purse swings out for very easy access to the critters inside. A large bolt and pair of fender washers and nuts does the trick.