Amazon has the AmazonBasics Hiker Camera and Laptop Backpack (Black) for $27 with free shipping. List price: $80. Can hold an SLR camera body with lens attached, plus a camera flash, charger and batteries.
Has good Amazon Reviews.
Ends 3/31. Amazon has the Tigernu Slim 15.6" Laptop Backpack with USB Charging Port (Black) for $26 - $8 off with coupon LS9MO8TS = $18 with free shipping. Features a built-in USB charging cable (battery pack sold separately), anti-theft zippers, and combination lock.
Has excellent Amazon Reviews.