Unsealing Technique

This technique is a standard ninja skill which allows a ninja to summon an assortment of items or weapons that have been stored using fūinjutsu, typically they are stored within scrolls. When needed, the owner will activate the seals releasing their item or weapon of choice. Scrolls can also be used as ammunition for other weapons. The items themselves are unaffected by time.

Puppets can have these hidden inside various compartments as a means of increasing their own killing potential as well as hiding useful weapons from the opponent's sight. Interestingly, objects with seals on them can be sealed in other seals, which expands the number of potential tricks a shinobi can use.

Even ninjutsu, like the Water Prison Technique, can be stored in scrolls and be activated when the scroll is opened. This can even be done without the will, or chakra, of the one holding the scroll, allowing for this technique to be used as a trap.

Trivia

 * Apparently, as shown in the anime, this technique can be used to store and summon more than just objects. For example, Shikamaru used a special scroll during his fight with Kakuzu to summon a large amount of water, and Tenten summoned a fireball from one of her scrolls against Guren.