It's funny - because of the subject matter, when I saw your tagline at the bottom (MS 150 Cycle to the Shore) I read it as "Cycle to the Store" and was thinking "wow, that's a long way to ride in order to get to a store!"

My rule of thumb for shopping is to carry one of the shopping baskets rather than a shopping cart. When it gets to heavy to lug around, then I know I have enough