page_title: Water canister
section_title: Design
hierarchical_section_title: Water canister / Design
caption_attribution_description: English: Illustration of the Hippo water roller.
context_page_description: A water container, water canister or water can is a medium-sized portable container for transport, storage and use of water. Large plastic bottles are sometimes called "canisters". Water canisters can for example be used for drinking water, wastewater or showering. Water canisters are used for excursions, camping, boat trips, in cabins without tap water, or as a household drinking water reserve in case of emergency.
  Water canisters come in many different materials and shapes, but are usually made from rigid plastic with shape as a square or rectangular cube. Typical capacities lie around 5 to 25 liters for household use. If the water is to be used for drinking, the plastic of both the canister, screw cap and tap should be food-safe.
context_section_description: Water canisters are made in many different sizes, with some of the most common volumes for household use being for example 5 L, 10 L, 20 L or 25 L. There are no common standardized shapes or sizes. Some canisters are for example designed to easily and sturdily be stacked on top of each other. Stackable water container typically have thicker walls to handle the added weight of being stacked on top of each other. There are also designs which are collapsible and can be folded when not filled with a liquid.
  Water canisters often have a carrying handle for easier carry. Some canisters are marked with several lines (for example in liters) to indicate the current amount of liquid, but there are also canisters without any level markings. Water canisters are usually made out of plastic, for instance polyethylene or high-density polyethylene, while caps and taps often are made of polypropylene or polyethylene. Some canisters have air vents which can be opened to avoid sloshing while emptying the container.
  Large water canisters may require a bung wrench to be opened (similar to barrels).
caption: Illustration of the hippo water roller (bottom), a barrel-shaped container designed to be rolled along the ground, as opposed to carried.
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