I had a big mailing job and needed to have envelopes that were put together correctly. On 60 out of 200 envelopes the sides were not glued. Pretty annoying since I couldn't use them with out tape or glue stick. Very disappointed.
The 200 envelopes purchased all had insufficient glue to actually secure the envelope for closing properly. We had to add either tape or white glue to secure the envelopes. Terrible quality control. I would NOT recommend this product.
It's an envelope so what can you say? Sturdy and reliable. I nave found that if they are not used for a while (how long I am not sure but at least a year) the gummed flap loses its stickiness and you have to tape the flap shut. Otherwise AOK