So this is a recent find that has made my life much easier, at least the farmer’s market shopping aspect of my life.  This rolling tote is from Sur La Table and can hold a ton of stuff.  It rolls really smoothly over the uneven terrain and has enough structural integrity to stand on its own, whether partially filled or packed.  I avoided rolling it through the terrible mud today, but it’s nylon and seems to be easily cleaned.  It folds up into itself very easily, making it easily stored in a car or carried along until needed:

It comes in a few patterns and solids, and best of all, it’s on sale right now - only $15.  Highly recommended – I imagine this being useful all summer long!