This cart-bike concept got me really thinking how a shopping cart that you own could make a real impact on the amount of disposable (landfill-clogging) shopping bags we use.
Here's a scenario: Imagine riding up to the grocery with a shopping cart bike. You park your bike at a rack and unlatch the cart to wheel into the store. Without using any bags, you can pay, put the groceries back in your cart, hitch up to your bike and ride off!
Some years back, IDEO worked on a concept for a smart shopping cart. I wasn't sure how practical it would really be. Somehow, I think this simpler variation is much more likely to make it past prototype phase and into real stores.
You might argue that multi-level dwellers couldn't manage without bags, but for those who don't have an elevator, a removable insert/basket could be built into the design.