Update on the "Double" sleeve--the larger sleeve designed to hold all double-LPs, and most triple-LP sets. Also, a demonstration of what to look out for to ensure you are getting the true "blake sleeve" and not an offshore knock-off.
Link to the flapLESS "Double" sleeve:
http://www.clearbags.com/bags/album/12-15-16-x-12-15-16-no-flap-crystal-clear-album-cover-100-pieces-blpdnf.html
