Portability refers to an object's ability to be moved, operated, stored, and/or carried. Portable shopping carts, then, are designed to be easily transported and take up as little space as possible. Striking the balance between functionality and portability can be challenging, though, especially if your store sells a number of large, heavy items. Still, certain features can enhance shopping cart portability without sacrificing their main function - to carry a certain capacity of products. http://www.tengtrolley.com/shopping-cart/