However it's also not that common for people here to carry lots of groceries at a time, unless you're planning a party. It's a lot more common to just pick up a few things each day: instead of one "big" shopping trip a week, most people make a short 10-minute stop every day or two, often on the way home from work. Partly for convenience, but partly also because that way your food is fresher. If you're shopping in that style, your groceries will fit in a regular bike's cargo basket.
However it's also not that common for people here to carry lots of groceries at a time, unless you're planning a party. It's a lot more common to just pick up a few things each day: instead of one "big" shopping trip a week, most people make a short 10-minute stop every day or two, often on the way home from work. Partly for convenience, but partly also because that way your food is fresher. If you're shopping in that style, your groceries will fit in a regular bike's cargo basket.