There are some extremely cute vintage quilted Chanel backpacks, like this black one and this metallic one. I’ve also seen a lot of vintage Louis Vuitton backpacks. Marc by Marc Jacobs makes a lot of nylon backpacks, here are some: plain black, red, blue, white striped, hearts, MbMJ logo, Batik print, plain brown, brown/grey/pink/cream, and this Miss Marc backpack. Alexander Wang also makes some backpacks: 1 | 2 | 3 | 4 | 5. Longchamp makes backpacks as well. They have a Le Pliage backpack, as well as leather backpacks in black, red, and brown. I hope this helps! :)