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Use more than one herb/enchant/etc bag
Normally you're only supposed to equip one of each of these new bags. However, for some odd reason (maybe a bug) this applies to the bank as well.
The way to get around this, is unequip all your herb bags, put as many as you want in the bank first, then equip the one you want to carry around.
If you equip one on your character first, it will not let you put any in the bank slots.
I'll leave it to you to decide if this is a bug workaround or an exploit. I really don't know how Blizzard intended it to work to say for sure.