Need a specific size of envelope, but don't want to buy a full pack? Make your own handmade envelopes in any size. (Plus, seal with homemade envelope glue!)
How to Make an Envelope With Paper: 5 Easy Steps - Uniquely Creative
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How To Make DIY Envelopes Tutorial - Hello Creative Family
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How do I seal handmade envelopes? 2 techniques for sealing – Eliv Rosenkranz