Slimline water tanks are sleek in design. They are less conspicuous which benefits those who store water inside a garage, barn, etc..., or even outside but do not want to take up too much space.
These are available in the same colors as vertical tanks, and are also molded with UV stabilizers.
Any of these tanks can be converted to be a rain harvesting tank. This consists of a rain basket installed inside the lid (a micro-mesh screen) - a 3" Overflow installed to your preference (to direct water that will normally overflow out of the tank) - and a 3/4" garden hose spigot, for the drain.