Are Bubble Mailers Packages or Envelopes? ... Once packed, if your bubble mailer is 3/4 of an inch thick or less, it's considered an envelope. If your bubble mailer is over 3/4 of an inch thick, it's considered a package. Your bubble mailer will most likely be a package.
Are bubble mailers letters or parcels?
Bubble Mailers and Envelopes are Considered Packages When They're 3/4 Inches Thick or More. USPS will only accept bubble mailers as packages if their total thickness is 3/4 of an inch or more.
Is a bubble mailer a soft package?
Soft pack. A padded envelope, bubble mailer, or plastic (Tyvek or Poly) sleeve. Packages thicker than 3/4 inches don't qualify for USPS First Class Mail rates.