I made my own pannier before. I used a great bag (it was a stylish tote/handbag) and I used replacement hardware and a wood clipboard for the stiff backing. It turned out OK.
me, too. I miss her.
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A couple of years ago we had a couple of young bike touring ladies stay with us (warmshowers). They were on a tight budget and one of them used homemade panniers made from two identical backpacks. The shoulder straps were cut and sewn together so the pair of backpacks draped over the rack. Some thin wood or hard plastic was inserted into the packs as a stiffener. They got her from DC to CO.