For years I used to just carry them on the handle bars. This was cheap, and I could carry over 1.5 cart fulls of groceries (about 120 pounds) but it took a long time to get everything situated on the handle bars and when large loads were hauled, there was a good chance one bag would find it's way to the front wheel and start rubbing through.
A while back, a cousin told us about Xtracycles, and so we caved and bought them; probably one of the better decisions we've made. One Xtracycle can easily carry a cart full of groceries, and more if you take the time to be a bit more strategic with placing the groceries. We've also hauled fire wood, tools, tree branches, and an endless assortment of other items with these bikes. If you can afford an Xtracycle, go for it, it'll be worth every penny.
