Pannier Backpack

Easy clip on waterproof Pannier for those rainy days. You're trying to save the planet, one pedal at a time, except there's torrential rain and you're soaked. Oh well, at least when you get to the store you can just unclip your pannier and stick it on your back so it won't get in the way or be stolen. And at 23-litres, that's quite enough for one shopping trip