Absolutely love the new bank & expanded storage update, it's just what I always needed! Amazing work!
The one suggestion I would make is that it would be cool if you could choose the size the boxes are displayed at, perhaps a toggle in the settings? So instead of having a scrollbar and a very long box, you could choose to have the bigger boxes just be displayed as bigger square boxes. Say if you have a box that's 120 slots large, it could be displayed as if you took four regular sized 30 slot boxes, and put them together to form a larger square 10x12 box, instead of the current 20x6 long box with a scroll bar we currently have.
A box this large might be hard to display on smaller screens, but those people could simply use the regular scrollbar boxes. However for people with larger screens, the ability to display the the entire boxes as large squares would be a godsend!