HEAVY DUTY & DURABLE: Made from 80% natural cotton/20% polyester to combine the benefits of both cotton and polyester. This combination combines the hypoallergenic qualities and abrasion resistance of cotton with the tear-resistance/stretch-ability of polyester to keep your tote looking smooth and lasting a long time! We use a premium 10 ounce fabric with heavyweight stitching, including cross-stitching at the handles for maximum strength allowing the bag to hold up to 35 Pounds of weight.