All of my boys are finally in school . . . which is amazing. However, it also means that we have THREE sets of everything to keep track of. That means we are flying through labels - labels on school supplies, labels on clothes, labels on sports equipment. Labels on things that might accidentally slip their way into backpacks even if they shouldn't - book, sunglasses, hats, electronics, etc.
I can swear by Label Daddy labels. We have used them at camp, to differentiate between toys and personal belongings here at the house, and year after year on our school supplies. They're washer/dryer safe for your clothes and shoes. They're dishwasher and microwave safe for your dishes. They are extremely durable and won't wear off or fall off without a LOT of work on your child's part. However, I have successfully peeled them off and moved them to a new location or a new item after months of having been used already on their previous item. They have a specially, laminated coating to help protect them. And they're made here in the US and shipped directly to you.
Your kids will enjoy the fact that they can pick any theme they would like. There are a ton of colors, sizes, and designs, including Marvel, Disney and professional sports teams. No matter how unique your child is, Label Daddy has a label that will fit them perfectly!