This mod is basically a "poor man's" substitute for a backpack mod, allowing Ender chests to hold 54 stacks of items (large chest size) instead of 27, while having the advantages of an Ender chest (i.e. contents not lost on death, transport items without carrying it; a Silk Touch pickaxe is still required to mine it though so it isn't quite as OP as a backpack).
Image of the enderchest with this mod:
Originally, this neat mod was made by The Master Caver, but it, unfortunately, is a jarmod, so one has to go though a lot of effort just to install it. I, however, ported it to forge, with full permission as said in https://i.imgur.com/WiCwxNZ.png and https://i.imgur.com/pQVSNKe.png.
F.A.Q
Q: When port to version x.x.x?
A: If you want to do it, go ahead, just credit me and The Master Caver.
Q: Modpacks?
A: Of course! No need to ask.
Q: There is a crash! / This mod doesn't work with X! / I found a bug!
A: You can always report it on the issue tracker and I'll try and take a look.
Discord: Click!