StormBags

Inside each bag is a super-absorbent polymer (the same class of material used in things like industrial spill kits). When the polymer contacts fresh water it locks the water into a dense gel matrix, expanding the bag from about one pound dry to roughly thirty-three pounds in about three minutes. That mass is what gives it the same pressure resistance as a sand-filled sandbag, without the sand.

Roughly three minutes from first water contact to full expansion, when submerged or thoroughly wetted. Absorbing rising floodwater in place takes about the same time. In lower-flow situations (a garden hose from above, for example) it can take a little longer.

Activate with fresh water. Salt reduces the polymer's absorption efficiency and you will end up with a partially expanded bag. Fresh water sources include tap, garden hose, rain, pool water, or clean standing water. It does not need to be filtered or drinkable.

Once fully hydrated with fresh water, an activated StormBag does block salt-water flooding, including coastal storm surge.

Depends on what you are protecting.

• One standard doorway: 4 to 6 bags is a common starting point.
• A garage door: plan on 8 to 12 bags stacked two layers high.
• Perimeter of a home: 20 to 50 or more, depending on layout and flood risk.

A supply of 20 dry bags weighs 20 pounds and fits in a small storage bin, so it is realistic to keep a full home kit on a shelf year-round.

Stack activated bags in a brick-layer pattern, offsetting each bag from the one below so the seams do not line up. That interlock distributes water pressure across the whole barrier and keeps individual bags from shifting. For a doorway, 4 to 6 bags stacked two or three layers high is typical.

As long as the polymer stays wet. In contact with standing water, an activated bag stays at full mass indefinitely. Left in sun and wind after the water recedes, bags gradually dry back down over roughly one to two weeks. Once fully dried, the empty bag can be stored and reused.

Cool, dry, and out of humidity. Original packaging or a sealed bin is ideal. Dry StormBags have an indefinite shelf life under those conditions. What you want to avoid is ambient moisture over months, which can partially pre-activate the polymer before you actually need it.

Yes, once they have fully dried out. Set used bags in the sun and turn them occasionally to speed drying. Store the dried bag the same way you would a new one, and it is ready for the next event.

The polymer core is non-toxic and the outer bag is burlap and linen, both biodegradable. Do not eat the gel and rinse any skin contact with water. Keep activated bags out of reach of small kids and pets, same as any deployed emergency equipment.

A useful side effect: a few dry bags placed around trees or shrubs during drought will slow-release moisture for weeks.

StormBags are non-toxic and landfill-friendly. Once dried, they can go into normal household waste. Or dry them, store them, and reuse them next time.

Yes. StormBag is FEMA and DHS approved and has been field-deployed by units including the National Guard. That validation is one of the reasons the product has been around since 1999 and stayed in service across every major hurricane season.

Three practical differences:

• Storage: 1 pound dry versus 30 to 40 pounds filled.
• Deployment: about 3 minutes per bag versus a crew shoveling sand for close to an hour.
• Supply chain: you already have the bags when the storm arrives. No hunting for sand supply during an emergency.

Once activated, an interlocked StormBag wall performs comparably to a sand wall of the same height. That parity is what put it on the FEMA and DHS approved lists.