This is NOT really 48 oz (not even 46 oz) practical capacity. It's more of a 44 on the underside of the lid which (as other reviewers have mentioned) is too difficult to open/close. And when the lid is in the "open" position, the flow rate is just over a drop. I read these reviews before purchasing but when I first got two of these the lids on both were a bit difficult to turn. But after several washes, the turning part of the covers began to move much harder. I would have sent them back, but I only found that out after 30 days. If you look closely at how it works, it really is the most overly complex lid design I've ever seen.
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