industrial tags

To label my boxes, I use vinyl tag holders. [2] These industrial tags come in several standard sizes [2].

Sizes I have considered going with:

(see also -- there are some similar products available. [1] [2])

badge holders (for a 4x3" badge)

These are even better, because they 1) fit a 3x5 card, albeit a trimmed one, 2) they fit the space perfectly, and 3) they're top-loading, not side-loading.

Vinyl badge holders

3x5 press-on vinyl envelopes

oh my gosh, perfect