In Phantasy Star Online 2: New Genesis, the Inventory is where you can view, use, and discard the items you have. The default Inventory space is 100, and can be expanded to a maximum of 200 with AC on a per character basis using the N-Inventory +10 ticket.
By clicking the magnifying glass icon on the top right, you can search through your Inventory. You can select to deposit items to available storages through the Inventory by clicking on a selected item.
Players can lock valuable items by selecting on eligible items and clicking on [Lock]. When multiple items are selected, you can lock up to 30 items at once.
Multiple Item Selection
You can select multiple items by pressing the [Shift] + [↓] [↑] keys, holding [Shift] and clicking the first and last item in order, or select multiple individually by holding [Control].