Flexitank onion tanks are a collapsible flexible tank, which when filled, is self-erecting. Flexitank Australia offer two types of onion tanks: open top onion tanks with floating foam filed collars, and roll top enclosed lid onion tanks.

Flexitank offers the largest range of onion tanks available anywhere in the world.  With capacities ranging from 1200 litre (317 USG), to 120,000 litres (31,700 USG) – the BIGGEST onion tank in the world – there is not a purpose or an application that our onion tanks do not suit.

Our onion tanks are the perfect solution for a variety of temporary liquid storage requirements and can be manufactured from a variety of polymer fabrics to suit virtually any application.

Onion tanks are primarily designed for applications where rapid deployment is required with minimal set up time:

  • Drinking water – emergency aid relief, potable mains water replacement
  • Temporary liquid storage for repairs and maintenance of another liquid holding device (tanks, swimming pools, ponds)
  • Temporary containment of almost any liquid (waste water clean-up, oil spill, chemical spills, decontamination)
  • Spill containment and water filtering
  • Frac tanks for hydraulic fracturing
  • Bushfires & fire fighting, helicopter refills
  • Rainwater harvesting
  • Short term construction site liquid storage
  • Military requirements

Onion tanks are offered in an 20 standard sizes that cover almost any liquid storage application:

For open top onion tanks, add 120mm to the height for the filled height of the onion tank including the floating foam collar.

Please note closed top onion tank are available in capacities from 1,000 – 15,000 litre options only.

All onion tank dimensions are listed as standard sizes supplied from Flexitank’s exclusively sourced Aqualine 850gsm TPO polymer fabric.

Check out Flexitank onion tanks in action:

Flexitank onion tanks provide an array of advantages unique to this style of flexible tank:

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Very quick setup time

Most Flexitank onion tanks take 1 – 4 people between 5 and 10 minutes to setup

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No frame or parts to assemble

simply unfold the tank and begin filling

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100% self-supporting

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Easy to pack down and fold away

Flexitank Australia’s design incorporates a reinforced ground sheet which doubles as a carry bag

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The nature and shape of a Flexitank Australia onion tank means they have the ability to fill and empty at a much faster rate than that of a pillow tank

Flexitank Australia’s design incorporates a reinforced ground sheet which doubles as a carry bag

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By utilising a greater height than that of a pillow tank, and onion tank will typically use approx. 25% less ground space to achieve its desired capacity

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Easily transportable to remote and difficult to access locations

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Flexitank Australia’s unique heavy duty construction makes our range of onion tanks suitable for a large variety of unique and difficult applications

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Can handle ground inclines of up to 10 degrees

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Open top tanks are supplied with a full cover

This protects the liquid being stored from dust and contaminants, which is very important in potable drinking water applications

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Closed top roll top onion tanks offer 100% contamination protection for the liquid being held as well as additional liquid security

a vital aspect when holding sensitive liquids

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Manufactured by Flexitank Australia to defence specifications using the latest welding technologies

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