1 Patterned Drawstring Backpack. Backpack is made from a durable polyester fabric. The inside of each bag is white and the drawstrings are black. Only eco-friendly water based dyes are use, so they do not fade or alter the texture of the fabric during our special manufacturing process. Try our fashion beach towel and drawstring backpack set, and if you??re not completely satisfied, simply return it for a full refund – no questions asked. You deserve to be comfortable – and worry free.