I was just playing around with Nova Cataclysms in Farmworld for mining and then... uh... I look in my bag I had been using to store ores and most of my stuff is gone! I had a bunch of powersuit and IC2 stuff in there (including a quantum chest piece) and all 5 of the powersuit items had Elite Battery upgrade. Needless to say I'm pretty mad about this. Oh, and the bag was white.
i suggest trying to dye the bag other colors or crafting another bag and see if u find it cause if u have stuff in a white bag and lose that bag and lose it if u make another white bag ull stuff will be there so my guess is it glitched and maybe the NBT tag got messes up or the information got moved to a different color of bag this is just a guess this may not do u anything i hope this helps
yea cause if i fill a white bag with cobble and some one else opens a white alcemlest bag they wont see my cobble