I would say the main feature I owuld look for would be size and pockets on the inside to keep everything neat and tidy, and a wipeable lining inside it- some of the gunk that ends up in my nappy bag is gross. I splashed out a bit and bought a really funky nappy bag- it was $100 but I've used it evey day for the last 18 months, so well worth the money. i figured if I wasn't going to have a handbag, I wanted a funky nappy bag