The summers are hot here in Canton so when shipping out fish we add one of these little packs to the box to prevent the water in the bags from overheating. These packs are handy if you are moving/shipping certain fish to a new home or on a hot summers day and you need to bring the temperature of the aquarium down. You simply fill from the top through the one way tab, stick in the freezer for a few hours and they are good to go.
Our polyethylene fish transportation bags have a flat square bottom to prevent fish from getting trapped or crushed in corners during transport. These highly durable bags are made from 100% virgin low-density polyethylene so there is no fear of water poisoning due to being made from recycled plastics that may not be aquatic safe. The bags can withstand up to 60kg of outside pressure and in 9 years in using them, we have never had one leak.
A must-have for every emergency kit in case of power cuts. We always keep a large stock of these as we suffer a lot of power cuts in the winter due to typhoons. We take the heater packs, wrap them in a piece newspaper, place them into a fish bag and let them float in the tank to maintain the temperature within the aquarium. The largest packs can stay warm for up to 110 hours ( about 4 days) and have seen us through some hard times. The shipping warmers are also essential in keeping fish comfortable if shipping fish across country or moving to a new home, particularly during the winter months.