
I have mixed feelings. They are very thick and strong, they don't tear and the seal is excellent. A small funnel is also very useful. I like how they fold up and are easy to store. BUT they are not easy to clean. They don't dry out inside either. I found they need to be rinsed immediately (which is fine) and then sit on the kitchen window. I left there a week after emptying and the remaining water still hasn't evaporated but it has gone bad and moldy. I usually fill them up and put them back in the fridge as soon as they get back to me, otherwise they just won't dry out. Even then, I eventually had to start throwing them away because they started to get moldy in places I just couldn't get to with a straw cleaner. So they're great for a temporary idea.

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