The Inventory is the player's most useful tool. You must press the to open it. It consists of a 4x8 grid that can store up to any number of items, weapons, or tools. It also has a 1x8 hotbar that is always seen, even when not using the inventory. Upon death, all items will be dropped except for the items left in the hotbar. (In hardcore mode ALL items are dropped, including items in your hotbar.) Many items, such as blocks and some items, can be stacked up to 64 per space. All tools and weapons may not be stacked because of each item's durability and for obvious balancing issues. It is always reccomended to keep your most valuable items in your hotbar, just in case death takes a sudden toll on your character.