If I could give this zero stars I would! How bad can an envelope be you may ask. Well let me tell you these things SEAL when you run them through a laser printer. So you have to stuff the envelopes BEFORE you print the address which makes the envelope thick and you feed fewer into the printer. Now if you're hand-writing or using labels you will be okay. So here I am immediately grabbing almost two hundred envelopes off the printer so I can UNSEAL them before they cool off.