Magic Jar

Magic Jars are a reoccurring pickup item that have appeared since The Adventure of Link. They are used to replenish Magic Power, which is consumed while using certain magic items, magic attacks, and magic abilities. In essence, the magic jars have the exact same function as Green Potions, but are not sold in town shops. They are most commonly found by breaking jars, cutting grass, or killing enemies. The jars appear in various shapes, colors, and sizes depending on the game.

Appearances of Magic Jars
Magic Jars in The Adventure of Link come in two colors. The most common jar, blue Magic Jars, are often dropped by defeated enemies and recover a small portion of magic power. Red Magic Jars are much harder to find and are usually hidden in certain areas of Hyrule's overworld, or dropped from dungeon statues when you strike them with your sword. The red Magic Jars recover all of Link's magic power.

The most consistent form of the magic jars, found in A Link to the Past, Ocarina of Time, and Majora's Mask, are the green decanters. Rather than representing the amount of recovery by color, their strength is denoted by size. These are known as Magic Decanters in A Link to the Past and Magic Jars in the Nintendo 64 releases. A small decanter restores it by one eighth. A large decanter completely refills the Magic Meter. Big decanters are much more common than the red variety in Adventure of Link, now dropped by enemies, but are still rarer than the smaller variety.

The Wind Waker continues the two-bottle tradition, but with slight changes. The large decanter still refills a sizable portion of the Magic Meter, but does not completely refill it. Both of the magic bottles change from their characteristic green color to tan bottles with brown designs.

Magic Container
The Magic Container is a type of Magic Jar that appears only in The Adventure of Link. Its function in regards of the magic meter is the same as that of the Heart Container in regards of the life meter: It increases the maximum magic power Link can have. These large, red magic jars, also like Heart Containers, will disappear from their location once obtained. The jar will add another square to Link's overall Magic Meter.

Unlike the Heart Containers, however, Magic Containers are very likely to be required to beat the game. The reason for this is that, if Link hasn't managed to increase at all the level of his Magic stat, he would need twice as many Magic points as his default amount in order to use the Thunder Spell, which is the only attack capable of disabling Thunderbird's invulnerability. With the Magic stat at maximum level, Link would still require four squares from his meter in order to cast the aforementioned Spell (and only under that circumstance would the collection of all Containers be optional). Magic Containers are relatively rare in the game, as they're hidden in secret zones of Hyrule. Below is a list of their locations:

Trivia

 * In The Wind Waker, two jars similar to the magic jars found in other games can be found on the table in Link's house.