These are great mailers for my eBay business of selling DVDs. They hold exactly one standard DVD in a case and are well padded and sturdy. The only con I can see is an address possibly smudging if the envelope gets wet--but this should never happen if mailed properly in the post office.
The size of the bubbles was perfect for the protection needed. It was very easy to seal. Just zip off the protective strip over the adhesive fold down the flap and run your finger over the top. Sure beats the potential for a paper cut on the tongue!