>>1654549A full week of real groceries in one go is going to be be pretty tough. I shop for myself almost exclusively on bike but plan on every 2-4 days to do some sort of grocery shopping. To get a full week though might require some serious compromise to the quality and freshness of your food - and I am not knocking rice, beans, lentils and dry spices. All that said I use a cheap 50L pannier off amazon on a tubus grand tour rear and then I put a origin8 messenger flat rack on the front on my bike. I can haul quite a bit pretty comfortably and could get several days worth of fresh eats to prepare a number of meals - with having some staples on hand to work with.
