Most back carriers are more structured with tougher fabrics and even metal frames in some instances. (thankyourbaby.com)
The form - factor is the same, a saucer - sized disk of tough fabric and rubber with a handy bungee cord loop on the back, it's still waterproof to IPX7, and so is the price, $ 99.99. (slashgear.com)
This one impressed me a lot - very tough fabric (tougher than the drift fabric) and cleanable using clek cleaner or solvent of my own choice (chemical guys). (albeebaby.com)