As you can see from the results, the 24 Pounds Strathmores and the Envelopes.com Press-N-Peel envelopes came out on top of this 5 envelope comparison. The 24# Strathmores, in my opinion, are a better product than the USPS uses for their own postmark product. I will be posting pictures from the experiment on Instagram in the following days. Each of the envelope types have links to their product pages on Envelopes.com. All materials, including stamps, mailers, envelopes, and postage were paid for by John West.