Express Trolley Bags Change the way you go about your weekly shop with these ingenious Trolley Bags. Specially designed to fit neatly into your shopping trolley, you simply roll them out, slot them in one end of your trolley and open them out in one easy motion. They come in four different sizes and always remain upright, making it easy to fill and sort your groceries as you shop or at the checkout. The bags easily separate when you place them in the car and roll away into a neat Velcro-fastened package when not in use.