Made of 1682 Denier Ballistic Nylon Large easy-access exterior pockets Ultra light, crystal clear Polycarbonate Cellular Memory frames support AVENGER XLIGHT products. Polycarbonate is both 50% stronger and 25% lighter than other honeycomb frame materials. Pathfinder's exclusive "DURAMAX" Ballistic Nylon yarns woven into a densely constructed fabric. Then the Duramax fabric is back-coated with a permanent urethane rubber water barrier then treated for stain & water repellency. We use the world's best zipper brand: YKK. We also use our own UNBREAKABLE steel & plastic zipper pulls. Our pulls are 75% lighter than conventional zipper pulls yet 20x stronger! Molded external components are made of ultra-high impact Polypropylene resin. Wheels are made with Polyurethane tires molded over rigid nylon hubs. Aircraft quality T6 aluminum tubes bear the load. Telescoping handle is engineered for zero-maintenance over a lifetime of heavy use. All major seams are tripple stitched. Heavy duty nylon webbing installed with reinforced "BOX-X" stitching. Plastic over-molding on heavy-duty die-cast metal hardware parts ends wear of metal. Expandability is built in to all 22" and larger wheeled trolleys. All pieces are fully lined with light weight, easy to pack & clean, light grey polyester fabric. All styles are reinforced for durability in heavy wear zones.