Review on Aviditi RM18SS Mailer Length Width by Ben Demers

Well they arrived last week and weigh 6.5 ounces each and while strong they don't stretch 1/2 inch as another reviewer stated and lack flexibility. If you only use the middle of the envelope it will stretch out a bit - but only in the middle and not on the sides. I'm concerned about the weight in 1st class parcels which have a 13 ounce weight limit and this extra Having weight and lacking flexibility makes me look for something else now.