If you have any Q boxes in the bank and don't want to open them until double Q days come around again you might want to leave them there. I couldn't get mine out of the bank (even by dragging it) on one toon due to he had a full first bag and then when I did retrieve a stack I couldn't return it to the bank.
And yeah, they changed it so we can't save our Q boxes to open on double Q days anymore. Lame, but, whatever. *grumble*