Mytwobabes on etsy. It cost me about $6 (each) for a pack that will last each kid through elementary school. The same labels that I stuck on DS's water bottles/lunch dishes for preschool 3 years ago are still going strong, that's with 3 trips a week through the dishwasher. I haven't used them on items that I launder, but I did stick them in DD's tap and ballet shoes at the beginning of the school year and they have yet to budge, even on fabric/leather.
Re: Kid stuff labels -- What do you use?
https://www.mabelslabels.com/
super cute! love them. love them lots!
We love InchBug labels - the Orbit labels and the sticky labels have worked perfectly for us.
Its a plus that they're locally based.
The O'Baby Blog
another vote for mabels labels. my sister sells them through an affiliate program on her site: https://littleaustinite.com/
I absolutely love Olivers Labels
https://www.oliverslabels.com/