I'm not sure how new they are but my LFS sells a lot of supplies including hard jugs like these (although not sure if they're Seachem) and they were very surprised when they saw a soft bag like this back then I came to fill it with reverse osmosis water. When dry they feel quite stiff and even a little brittle, but once filled they seemed surprisingly strong. They are somewhat flexible but maintain their overall shape. Just don't expect a collapsible hydrotoe to be a perfect cube when filled with 5 gallons of water. Love the fact that they fold very compactly when empty, they're a lot easier to stow away after I've used them for water changes, and at least easier to toss in the car while I'm driving. to refill them! They take longer to empty than I expected, but then again the actual size of the outlet in the nozzle is very small, so this would be expected if I actually used a brain cell to think about it. I found I could speed it up a bit by tilting the jug back and letting air in through the nozzle, then tilting it back and using the new air to fill the top of the pressure jug by squeezing it. You could probably also leave it on a chair or table and drain it into a bucket or something similar before pouring/pouring it into the tank if you just want to use it for storage instead of over the tank for water changes keep. Overall I'm very happy with the two I have and plan on getting a few more.
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