Shiren 1 DS:Jar

Jars (Japanese: 壺) are a category of items in  Mystery Dungeon: Shiren the Wanderer, often having strange and unusual effects. They also have some of the most potent abilities in the game. The Chiropractic Jar is easily the best healing item available, and the Melding Jar is an absolute necessity for creating extremely powerful Weapons. 

There are two primary types of jars: "Insert" Jars have "slots" (spaces inside the jar) that allow you to Insert other non-jar items into them, while "Press" jars have "backs" in/on them that you can press to trigger various effects. All jars come with 3 to 5 of these "slots" or "backs".

If a jar is transformed into another item through any means, then its contents will be lost.

Jars

Jar		Shop				Description
English	Japanese	Cost*:	Cost+	Value*:	Value+
Bottomless Jar	底ぬけの壺	2,500	250	750	75	Items put inside will disappear forever. Breaking it will cause Pitfall Traps to appear.
Chiropractic Jar	背中の壺	1,500	150	450	45	Pressing this jar will recover all your HP and strength, while curing some status effects.
Gaibara's Jar	ガイバラの壺	15,000	1,500	4,500	450	Expensive. Doesn't actually do anything, though.
Jar of Change	変化の壺	1,200	120	360	36	Items placed inside will permanently change into something else.
Jar of Hiding	やりすごしの壺	1,200	120	360	36	You can hide in this jar, or throw it at monsters to trap them inside.
Jar of Holding	保存の壺	1,200	120	360	36	Items can be freely inserted and removed from this Jar.
Jar of Identity	識別の壺	3,000	300	900	90	An unidentified item put inside will become identified.
Melding Jar	合成の壺	5,000	500	1,500	150	Consecutive weapons, shields, or staves will combine. (Staves must be of the same spell.)
Monster Jar	魔物のるつぼ	1,500	150	450	45	Spawns monsters when triggered.
Pointless Jar	アホくさい壺	1,200	120	360	36	Does nothing. Pretty pointless.
Storehouse Jar	倉庫の壺	2,500	250	750	75	Items put inside will be sent directly to the warehouse in Canyon Hamlet.
Strengthening Jar	強化の壺	10,000	1,000	3,000	300	Weapons, shields, staves, and Gitans will increase as you enter new floors.
Unbreakable Jar	割れない壺	3,000	300	900	90	When thrown, will bounce off a wall and disappear, taking any items inside with it.
Venting Jar	うっぷんのばらしの壺	10,000	1,000	3,000	300	Throwing this jar will cause it to explode upon impact.
Walrus Jar	トドの壺	1,500	150	450	45	A Thiefwalrus comes out in the direction you are facing and will steal items for you.
Weakening Jar	弱化の壺	10,000	1,000	3,000	300	Weapons, shields, staves, and Gitans will decrease in level as you enter new floors.

References

• Data via Akurasu.net