Custom Backpacks, Eco-Friendly 80GSM Non-Woven Drawstring Backpack - Recycled Material, Easy-to-cinch nylon cords fed through reinforced grommets. Non-woven 80GSM material. Eco-friendly. Polypropylene, made of 100% recycled materials. *Enjoy free full-color heat transfer until 12/31/24. A $60 (v) set up still applies. ... #B516 $1.65/each.