Walmart with Muzpu has the Muzpu 50L New Premium Travel Backpack (XL) on for $35.99 - $2.50 off (check "Save $2.50 extra") = $33.49 with free shipping (no minimum) with Walmart+ (30-day free trial) or on $35+.

Also check out:

• Joyway 2-Piece Travel Backpack Set is $36