I added botania items into a new tag and when I went to save, it crashed the game. During that time, I also deleted some of the items in my inventory. Here is the crash report, and it appears to be client side.
crash-2017-07-30_14.45.04-client.txt

Hrm... Looks like your tag contains too much information. I didn't know that was (realistically) possible...
Are you using a large amount of items, or items with a large amount of data or something?

Items from botania, some Items, such as mana/terrasteeel armor and rings may contain a lot of data.

Pack I was working on is no longer in use. Nor was ever uploaded.