Did you know?
Posca markers can be permanently sealed onto fabric through heat
https://www.posca.com/en/support/fabric-textiles-and-skins/
The USPS will send you up to 600 label stickers at a time for free
https://store.usps.com/store/product/priority-mail-address-labels-P_LABEL_228
There's a bit of a underground market to get them out to people who get banned from ordering too many or to people not in the US who like them for the novelty
https://www.ebay.com/sch/i.html?_nkw=228+usps+&_sacat=0&_from=R40&_trksid=p4432023.m570.l1313
