Treasure Chest
Treasure Chests are what holds any form of item or weapon inside them in many Zelda games. In some Zelda games, there are larger chests that require the big key to open. In Ocarina of Time, Majora's Mask and Twilight Princess the chests have a bright light coming from inside them when opened if they contain a vital part of the dungeon, such as a map, compass or a new weapon. The Big Key chest looks more intricate in these games and have a golden lacing around them or a different color or design and have much more spark when opened.
In The Wind Waker, you are able to hook treasure from the bottom of the sea using the Grappling Hook. In most 2-D Zelda games, the treasure chests all look alike, which makes it hard to decide if you really need to go through the trouble of opening it.
Also, in A Link to the Past, Link's Awakening, Ocarina of Time and Majora's Mask, the Hookshot is capable of latching onto the side of the chest, allowing Link to travel over and subsequently be able to open it.