Trapped Chest

Trapped Chests are blocks which emit a redstone signal from all sides when opened, at a strength of one block per player using it up to 15 players. The Trapped Chest can be told apart from a regular chest by a slight orange tint around the latch and a red line on the rim of the opened chest. Trapped Chests can be made into double Trapped Chests, and are able to be placed adjacent to normal chests without interfering, allowing two chests, or double chests, to be placed adjacent to each other. When you open one, a red shading will be visible around the chest inventory.

Usage
Trapped chests emit redstone signals based on the amount of players opening it (up to 15 players). You can also use them as traps or decoys. So it is useful if you don't want your goodies to be stolen. They are able to be placed adjacent to normal chests and store more stuff (not turning into a quad chest). So they may be useful if you don't want to give up one block of spacing between chests and double chests.

They can also be useful to secret exits and doors (without using a door because they act like a lever).

Trivia

 * Trapped Chest's item in hand is like a normal chest.
 * If a dropper block is placed behind a trapped chest, opening the chest will cause the dropper to put an item in.
 * Trapped Chests can be placed directly next to normal chests, allowing for more compact storage.
 * Trapped chests can be used similarly to levers, which might be useful for mazes or secret entrances.
 * Trapped chest is categorized as Decoration Blocks in the Creative Inventory although it emits redstone signal.
 * Trapped chests can be placed facing a wall, hiding the orange tint.