How much can you actually carry?
More than you’d think. A foldable pair like the Bushwhacker Omaha holds a paper grocery sack upright in each side, which is roughly a two-bag shop — enough for most weekly runs for one or two people. The single OutWurx (23 L, with a snap-secure inner tote and a rain cover) carries a solid half-shop and locks down on an e-bike rack; buy two for a full load. The keys to a comfortable ride home are simple: keep the heavy cans and bottles low in the bag, balance the weight left and right, and put anything crushable on top. Our guide to carrying groceries on a bike walks through the loading order.
The other decision is security and weather. Open-top grocery panniers are fast to load at the checkout but don’t secure valuables and aren’t waterproof — fine for a bag of vegetables, not for a phone in a storm. The OutWurx’s lock-down mount and rain cover make it the pick if you park an e-bike outside a store, while the Rhinowalk is the one to buy if the same bag has to carry your laptop to work on weekdays. Whatever you pick, it needs a solid rear rack underneath it — see our best rear racks.
A grocery pannier spends more time unattended at a rack than any other bag on this site, which raises a question none of these listings answer: what, if anything, you can do to stop someone lifting it off. The four methods that actually help — and the honest reason the best one is free — are in how to lock panniers to a bike.