I haven't had any issues with it coming undone in my diaper bag. No spills or anything. I used to use the container that could hold enough formula for three bottles, but I needed something that could hold more. This is perfect for our outings or weekend getaways. Only thing I don't like is the scoop that comes with it is pretty small and the cutout for the scoop only fits their scoop, not the standard scoop that comes in most formula cans.
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