Making Bed-Rail / Walker Bags for use in hospitals and institutional settings. Fabrics are made from recycled plastic bottles, FR, anti-microbial and water proof in bright colors and patterns...using the webbing for bias and as strapping to hold the velcro closures to secure to bed frames, walkers or wheelchairs.  Do not need high tensile strength...more interested in soft feel, color and widths from 1 to 2 inches. However need water proof webbing that is not stiff. Possibly  your 500 series?