Minecraft Version: 1.10.2
Inventory Tweaks Version: 1.61

I am attempting to enable the sorting buttons to the Storage Bag from Cyclic by Lothrazar.
I have created the InvTweaksCompatibility.xml file and added the line(s), but I cannot be sure that I am doing it properly.

For the line, <inventory class="mod.container.MyInventoryContainer"... what would be the format for mod.container.MyInventoryContainer?

I have tried:
mod.container.ItemStorageBag (named after .class file found in mod)
cyclic.container.ItemStorageBag
cyclic.container.storage_sack (named after item name in-game)
cyclic.ItemStorageBag

I can't tell you what the right thing is for any specific mod, but you're looking for the Container class, not anything directly related to the item or block (Container is the server + client side part of the GUI display layer)