I plan to use these “envelopes” along with mini mailboxes (found at Target $ Spot) as a way for my kiddos to practice all kinds of skills (spelling words, sight words, math problems, etc). They will either copy the word on the back of the envelope onto the front or for math write the answer to the math fact.
For my speech therapy followers, this would be a great activity for students to write target words or draw pictures or use stamps to make mini-flashcards. Students could make flashcards for each other. After your speech session, allow students to punch holes in the corner (“stamp” them) and put them on a paper clip or metal ring to practice for homework.