Basics

A Trademarked Combination of a Water Storage Container and Interlocking Bricks
While not as Ergonomically Ideal as a Jerry Can or as Storage Dense as an IBC Tote or 55 Gallon Drum they do allow for modular setups that fit a space (Such as a home Walk In Pantry or Garage nook better, and allow for Storage/Stockpile Capacity to be built up Gradually (and thus POTENTIALLY more affordably, Financing notwithstanding)
Also unlike a Cistern or fixed Rainwater Storage Tank they are highly portable
Also unlike fixed storage tanks or Large Totes/Drums they also can be moved around and used as small containers without additional dispensing requirements
Main downside is cost/complexity, and slightly slower Filling (ie instead of going from 0% Filled to 100% filled with a tap, or putting a Garden Hose in the top of an IBC Tote etc, one would have to fill all bricks one by one
While they may have more potential failure points per unit of volume stored ( Square Cube Law and all that), in the event of tank failure/leak formation, the lost volume could be confined to one brick and thus only a small fraction of the whole
- An Inventory+Routine Inspection Log is probably in order though for Ideal Use

Comparison with other Containers

May be worth it’s own Wiki Page, BUT:
- Ergonomics are better than Water Brick International’s Offerings supposedly (more integrated handles a la Eagle Safety Can vs a PROPER Jerry Can )
As per reviews supposedly stacks securely
- Other brick probably isn’t half bad
- The Reliance Products Aqua-Tainer 7 Gallon Rigid Water Container CAN stack, but it isn’t Ideal
- Flexible Water Storage Bladders cannot be stacked, but in theory could be made in all sorts of shapes/sizes
- IBC Totes cannot be stacked, even if full, but without a Forklift (and even if then, when filled to the brim be sure to check the Weight Capacity of the forklift) they cannot be moved easily
- When empty 55 Gallon Drums CAN be stacked about 3-4 High if the “ends” are capped with a Wheel Chock or 4x4 Lumber etc but it’s not ideal
  - Dedicated Holder Pallets and/or Adapters (Such as multi-barrel Rain Barrel assemblies are required
All in all if only small volumes are needed, get an Aqua Tainer from Wallmart, or use old “disposable” Jugs etc
- If large(r) volumes, without Warehouse Level Logistics, are wanted/needed though, these seem like a good way to go

They tend to come with a Ventless Spigot / Spigot Cap for dispensing
They also sell a proprietary Lifestraw -like Microfiltration based Filtering-Dispenser Pump, but this is Largely Unnecessary with Proper Potable Water Storage or a more dedicated (ie not per storage container) Potable Water Filtration strategy
- Also not required for water that need not necessarily be Potable (although perhaps still mostly “clean”, such as for Flushing Toilets, Rinsing Things Off, For Watering Plants, etc)
They also sell a Funnel for ~22 USD, although short of Food Contact ratings/some ease of use advantages over Layer Line covered FDM 3d prints etc this may not be 100% necessary