I have a bag that only fits a standard size water bottle. I carry a water bottle with me and the epi pens in another. This water bottle is the only refillable bottle that has worked for me. I can just fill it up from my fridge or water cooler at work and take it with me. It fits just enough to go from one refill to the next, although it says it shouldn't be filled to the brim with liquid to avoid leaking. The bottle leaked a bit when I laid it on its side after filling, but it never got soaked and never layed on anything that couldn't get wet. That's not a problem for me, and if you carefully fill in and tighten the sections, I don't think it will be a problem for anyone. I bought 5 different colors and patterns and can easily switch between them. The only drawback is that the lids are not dishwasher safe. I used to put them in cutlery boxes and lock them, but I don't know if they say that because they're too light and can sink to the bottom, or because the material breaks. So far I've only put the attachments in the dishwasher once.
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