BulkBag

Lets you Ctrl+click or drag-select multiple items in your bags at once, then move them all in a single click — including into bank and guild bank slots. In-game options: /bulkbag — item selection itself is mouse-driven. Hold Ctrl + Left Mouse Button to select multiple items, or hold LMB and drag across items to multi-select, then click an empty bag/bank/guild-tab slot to move them all at once.