100% Polypropylene Imported Polypropylene Premium Material: This shopping bag with wheels is made of durable polypropylene, which is water-resistant and easy to clean both for external and lining materials. No matter how frequently you use it to the store, picnic or travel, these bags are built to withstand the test of time. External Multifunctional Pocket: There are PVC pocket, mesh pocket and zipper pocket arond the main bag, you can put different essentials in differnet pocket. Can keep your groceries, accessories orgainzed, you can find them easier. And your phone, keys and identity document which is important personal items in the zipper pocket to keep their secure. Swivel Slience Wheels: The medium size use 4pcs swivel slience wheels, it can roll smoothly on any surface.