There’s a whole string of ‘poster’ and ‘t-shirt’ stores that sell various things ranging from small ziplocs of various sizes to scales, rolling papers and crack pipes. (These stores are distinct from the ones that sell hemp clothing/goods, books about the usefulness of hemp, and tobacco pipes.) What’s really weird about the ziplocs is that they’re available with various logos printed on them that must make high-school dealers seem really, really cool. Marijuana leaves, smiley faces, dollar signs, and so on. Really, really cool.
Occasionally, I’ve seen lab manuals call for putting samples of chemicals into ‘1"×1" polyethylene bags’. This would appear to be a legitimate purpose for these bags, but in reality we’d always use glass sample vials instead. That being said, the aforementioned ‘poster stores’ also sell glass sample vials.