Bins nest freely. A bin (call it box, bag, container — it's just a name) can hold cards and other bins, to any depth. Build the tree below to match your real storage.
Print a QR label (🖨) for each bin and stick it on the matching real box / bag. The label's code never changes when you move a bin.
Scanning a card files it into the current bin. Scan a bin's QR (or tap “set current”) to choose where; unscanned cards land in Unsorted.
Move anything: drag a bin onto another bin, or tap ⤴ on a bin/card then tap Drop here on the destination. On a phone, use 🔦 Find → Move to scan.
To find a card later, open 🔦 Find, search it, then scan your bins — the right one glows green.