These free standing trolley totes save so much time and hassle at the checkout designed especially to clip into supermarket trolleys theyre like an extra pair of hands because they stay open and upright while you pack infinitely superior to cheaper trolley bags these are made of premium quality water repellent woven polyester and have velcro strips around the openings so you can close them up to secure contents theres also a zipped pocket inside each bag for hiding your keys money and