Traditional kitty litter buckets are free with lids but probably smaller.
I do have to wonder about the guy who buys the premium cargo e-bakfiets, and then objects to a few hundred for panniers. Clicking around I find he's built it as a 2wd e-bike! Maybe he hasn't got any money left
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Genesis 49:16-17
"Well, well!" said Holmes, impatiently. "A good cyclist does not need a high road. The moor is intersected with paths and the moon is at the full."