This pdf template for making your own 8.50" x 4.50" envelope is a really useful tool. Once you have the hang of making one you can make them smaller or larger by just adjusting the lengths on the dotted lines. Enlarge and print once and use as a template or just print page 1 when you need it (for a slightly smaller envelope). All you need is paper and glue stick or double sided tape.
Handy if you mess up a Christmas card envelope or if you just need more! Of course you can make them out of printer paper, but you can also use any other paper of a suitable weight.
Keeping busy indoors
2 hours ago