BetterStorage mod adds in Minecraft Pocket Edition, three new storage type things in the game. The first type is a storage unit that works on a similar principle as a normal chest. The second type of storage is a backpack, but backpacks are divided into subtypes, which are many. The backpacks differ in color and capacity. There are backpacks with a minimum capacity of 9 slots, and there are backpacks that can hold in its inventory slot 72 for storage. But the third type of storage is the Ender Chest. Blocks of Storage and Backpacks: the Units of storage and backpacks have 4 levels. The highest level is equal to the increase of slots for storing items. Thus having the backpack or storage unit with a high level you can store a lot more things than with a small level.
Blocks are used as Storage chests.
The backpack is very mobile because you can wear them on hikes. To open the backpack, take it in your hands and hit the ground, which opens the GUI of the backpack which you will be able to manage your things.
Ender Backpack can be used to access the storage unit when you are in proximity to it. Click on the Storage Block, the Ender Backpack to open it.