Pocket Dimension

Example items utilizing pocket dimensions.
 

Bracers of the Armory

Wonderous Item (Uncommon) (requires attunement) These Bracers will store a single weapon sized for a small or medium-sized creature. They can be recalled as a bonus action once per day or stored or retrieved normally as a full action. This is done by using the command word linked to the bracers.
 

Forever Lantern

Wondrous Item (Uncommon) This Chinese style lantern (see image) when filled will keep a hundred quarts of oil in its container that takes up only a small jar of size or weight. This allows it to continue burning for a very long time.
 

Cane of Many Uses

Weapon (Very Rare) (requires attunement) This 18 inch long rod of silver stores extensions in a pocket dimension. When found it usually has its cane form with a wooden carved head on one end and cane height wooden length on the other. The Cane has 6 charges and for one charge can switch the extensions to the silver rod. 1d4+2 charges are restored at sundown. The extensions available are cane, rapier, 10ft pole, 20ft pole, pick, hammer, staff, spear, and falchion. The cane counts as silvered and magical for purposes of damage resistance.
  Ring of Changing Wondrous Item (Uncommon) (requires attunement) This ornate ring stores one complete outfit. The ring has three charges and you may use one to swap your existing outfit for the one in the ring. The change takes one full action, you can force it to be a quick action but you must roll a 1d10 and on a result of 1 the change fails, the ring is destroyed, and the outfit stored dumps on the ground. Only the clothing and belt pouches change, no backpacks or weapons. It can also only store up to 20 pounds of clothing and accessories, so most armors are too heavy as well. Charges refill at one charge per fancy large meal you consume to a maximum of three.