The first step to achieving a more portable shopping cart is building it from strong but lightweight materials. Heavier carts aren’t just more difficult to push and pull — they can also quickly gain momentum, leading to accidents and injuries. So, the lighter the cart, the easier and safer it is to maneuver. Of course, this doesn’t mean a cart can be built from cheap materials.
http://www.tengtrolley.com/folding-shopping-cart/
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