Here is what iv noticed. Iv filled them up, and by the time I got the last one filled up the first one I did was totally drained. It is not a slow release system as it describes. The tubes on the underbelly side (in review pictures) just consistently let the water out with no breaks or slow flow. What I need and was expecting was something I can fill up and it will be ok for 2-3 days before having to refil. Not all gone in 30 minutes type of thing I received. I did order 2 batches of these, so 8 individual “slow release bags”. And every one of them responded the same way as to what I’m referencing in my review.