I want to make an item like lootbag

[CrashGod]

Guys I am using forge for a mod I am trying to do but I don't find any resource for how to do a hand-chest like item. Like lootbag mod I just want an item contains a few items inside.How can I find resource about that? or are you have any idea about it?

 

I am adding Metallica albums to the game and I want to put songs their albums and carry them together like lootbag mod do you guys know any resource for coding something like lootbag

(I want to be able to carry an album contains all songs inside and right-click select the record) 

to sum up:

I need an album item contains all song disc items already inside and take and put them back like chests

How can I do this?

[Alpvax]

implement the IItemHandler capability for the album itemstack and open the container when right clicking the item, just the same as you would for a block entity container