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Rainwater Storage Bags

A Practical and Durable Solution for Harvesting Rainwater

Looking for a way to build a rainwater collection system? Would you like to know how to start and what you will need? Portable Tanks, a division of Water Storage Tanks can help answer these questions and help you set your project up for success.

Collapsible tanks (also known as Rainwater Storage Bags) are a great choice for a rainwater collection system. These tanks have been used under decks, in crawl spaces, and even in basements for rain water harvesting projects. In addition, they are also highly durable and UV resistant for use in outdoor locations.

rain water collection tanks

Rainwater Collection System

Typically, rainwater is collected off the top of a roof or downspout. This water is then directed into the tank using inlets. Water may be pumped out of the tanks using standard fittings such as bulkheads with cam lock, storz, or threaded adapters. These will attach to hoses to discharge water from the tank.

Questions? We can help! Call our team at +1-863-261-8388 or fill out our quote request form to discuss your requirements.

Advantages of the Collapsable Rain Water Storage Tank

Compared to other options, collapsible rain water tanks can be an extremely economical and reliable option. This type of tank benefits from having a low profile and large capacities. These features allow it to fit in tight spaces such as under porch decks, in basements, and in various crawl spaces that may be present in your location. When empty, the rain water tanks lays completely flat and can be brought into areas that have an opening hard tanks could not get through.

Some common advantages you will see for collapsible rain water tanks include:

  • Long-Lasting Construction
  • Flexible Fitting Options
  • NSF 61 and FDA Approval Options
  • Sizes up to 210,000 gallons
  • Multiple Rainwater Reuse Options as tank may be connected to:
    • Sprinkler Systems
    • Backup Well Water Storage
    • Garden Irrigation
    • Water Utilities


Fittings for collaspable rain water tanks most commonly include a ball valve, pressure relief vent and cap. They can, however, be specified for your rain water harvesting project and placed in designated locations.

How Much Rain Water Should be Collected?

Rainwater can be used to supply water to many applications. This may include running a sprinkler system, backup water storage, or even to run the water for a whole house hold. If you know what you would like to use the rainwater for, filling out the information in this Water Consumption Calculator can help find the size you need.

Interested? Contact us!

If you are looking to start a rainwater collection system. now, would like to know more about ordering or just have more questions about a rain water harvesting project, do not hesitate to contact us!

Questions? We can help! Call our team at +1-863-261-8388 or fill out our quote request form to discuss your requirements.