10×13 Envelopes, Tyvek Envelopes, Mailing Envelopes 10×13, Catalog Envelopes, Self Sealing Closure, Tyvek Material, 14 lb., Puncture, Tear & Moisture Resistant, Bulk (100 Pack)

Although these envelopes arrived with a crease in all of them, it was not terribly difficult to get the envelopes to lie flat.These envelopes are working perfectly for holding my different groups of receipts that I collect throughout the year and need to have handy at the end of the year when I am preparing the taxes.Since this set is a 15 count of envelopes, I have plenty of envelopes to keep my different groupings of receipts separate, and still have a few more envelopes left over in case I need to make another receipt grouping.In the past, I have used just regular 10″ X 13″ manilla paper envelopes. Sometimes, towards the end of the year, as the envelope is getting pretty stuffed with the years receipts, the envelopes have torn slightly on the edges of the top opening. These envelopes feel tougher than just paper. It almost feels like some kind of cloth has been added to the paper during manufacturing, making it very difficult for the envelopes to tear if over stuffed. This will be extra helpful with the envelopes that, by the end of the year, may very well be over stuffed with multiple receipts.I used a permanent marker to identify the content receipts groupings on each envelope. The envelope material is thick enough that the marker writing didn’t bleed through the paper at all.These envelopes would also be perfect for mailing packets that include multiple sheets of regular letter size paper. Since the materials these envelopes are made with is extra strong, any papers that you may need to mail that are very important have a better chance of not getting damaged during the mailing process.