This is a new method I discovered while playing earlier, it's a lot easier than the other method I have seen. All you have to do, go to your bank, select the menu to store an item, click any item in your backpack (NOT the item you want to store), it will transfer your menu to the bank to select the slot you want to store it in, push back to your backpack menu and click the item you DO want to store, and viola, it pushes the second item into your bank without taking something out. I have verified on both consoles that this works and saves the item after quitting and reloading and everything like that.I do not have the PC version to test but I imagine it will work the same. I was playing earlier and discovered this method, I have been looking all over the message boards here and Gearbox as well as some others and youtube and I have not seen this method described anywhere else and wanted to share. This is much easier than the previous method of buying vendor guns and overstocking your backpack to overstock your bank. If this is a re-post of somebody's glitch, link to it when you accuse me, and I will apologize.