Lets you have compressed versions of ANY BLOCK/ITEM from ANY MOD. Just add what you want in the config file.
(But it's early days so please do report any problems you might come across)
UPDATE:
I'm changing this mod to a general utility. Instead of adding items to have compression, everything will be compressible by default and you can then override for things (Like add non 4 or 9 sized packets for certain things).
Also version 4 is incompatible with lower versions. Your old compressed items will stop working. So decompress them before using the new version and recreate them with the new version.
Vanilla minecraft (3x) (Large image):

Extra Utils 2 (3x) (Large image):

Storage Drawers (3x) (Large image):

Dev plan:
Known Bugs (Comment down bellow or use github):
No files available for download.