Storage

Infinity Storage units have many benefits!

Each unit holds 1 item type.
Depending on the unit, quantity varies, from 6,400 in the Basic Storage Unit, all the way up to 1.6 billion for the highest tier!
Can be used with cargo for input and output.
Integrates with Networks.
Has handy buttons for withdraw/deposit all.
Contents are kept when breaking.
Fairly cheap to make starting off.

On MCT, there are a few types of storage options, including Fluffy Barrels and Network Quantum Storage Units. While Fluffy Barrels are easier to make, and hold more items, they do not integrate with Networks, like Infinity Storage and Quantum Units do. This means autocrafting from Fluffy Barrels will be harder and slower. However if you do not plan to setup a Networks autocrafting system, then Fluffy barrels may be an easier and cheaper option!

Storage Forge

Description: Upgrades the tier of Storage Units. Retains stored items.

This item can be crafted in an Enhanced Crafting Table

Even though it's in the description, upgrading storage units does keep contents!