The name on the box says it all, MAIL LITE.
This D1 size wieghs in at just 13 grams per envelope. So, they are perfect for sending DVD's overseas if you are trying to keep your postal charges as low as possible. For UK deliveries the weight is not so crucial as the cost of sending ONE DVD with the UK is the same up to 190 grams and most DVD's weight less than that. - However, you can actually get THREE standard DVD boxes in these 'lopes! It is a mighty tight fit with 3 though.
They are easy to write on - best with a felt tip type pen. They peel and seal shut beautifully.
Look at all of the sellers selling these and compare the total prices (item and postage) and you can grab yourself a real bargain - I paid £9.40 in total for a box of 100 - the cheapest, best quality, light weight and strong DVD mailers I have used - Recommended BUY.