The experience container mod from https://www.curseforge.com/minecraft/mc-mods/expcontainer is a mod where you can store experience in a barrel container and when you break it with silk touch axe, you gain the barrel with the stored experience but if it is broken with an axe without silk touch, it drops the barrel and the exp as exp orbs. The problem is that there is an exploit with the bag of souls enchantment that multiplies the amount of exp dropped by the barrel which makes it possible for an inf easy leveling exploit. Is there any possible work arounds or fixes for this exploit?

Thanks for letting me know about this. I can definitely look into this

Bag of Souls is now disable-able.
Souldance Robe, which is to get an effect in a similar vein to Bag of Souls, will also be disable-able.