These are not breather bags at all. They're not even particularly good as basic fish transport bags; there are much better options in the same price range. Don't waste my time and money like this.
After leaving the bag sealed full of water inside a container of water, absolutely no gas exchanged between the bag and the container. I recorded the bag using a timelapse to examine the rate of exchange. In this case the rate is zero.
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Items exactly as advertised. Recommended seller on eBay!! A+++ It’s a long way from China, so delay in shipping understandable. 🙂