Customers with specific needs may prefer to use their own cart when shopping. These personal shopping carts are often portable by necessity, as they must be light enough to carry and/or maneuver at all stages. As such, most personal carts are folding shopping carts, which handily collapse when they're empty to take up as little room as possible. When opened up, these carts often reveal a deep nest for several products to rest. Retailers and grocers can keep their customers satisfied and make additional sales by selling portable shopping carts. There are many types of folding shopping carts made of different materials such as plastic folding shopping cart, metal folding shopping cart and aluminum folding shopping cart. http://www.tengtrolley.com/folding-shopping-cart/plastic-folding-shopping-cart/