The proper postage is essential for a perfect send-off once you are ready to sign, seal, and deliver! Should you choose our F-8 size (6.25 x 8.3125), there are a few things to keep in mind:
This means they should never fall into the “letter” category. We have observed some post offices mistakenly use First Class Mail Letter rate instead of the First Class Mail Flat rate. Regardless of envelope size, mailing as “flats” should ensure that the post office will handle a thick envelope more delicately—reducing the risk of damage.
Bear in mind that different post offices may give inconsistent guidance on how to handle thick envelopes. As a result, we recommend you stress the importance of these above-mentioned guidelines.