These are a good idea from Contigo but there are a couple of nitpicks. First, the good. These fit slim cans well and keep your drinks cold. The lid swap makes conversion to a tumbler easy. However, on that point, it might just be me but do you want your tumbler that you actually drink out of second as a can holder with cans going in and out of them? Yes, you should wash them for that purpose but that's kind of the point of these high tech koozies that Yeti and, now, Contigo are selling. You don't need to wash them all the time. Further, these have a lip on them that extends out a bit when you are using them to hold cans. Yeti uses a tapered type lid that doesn't protrude out as much giving you a better drinking experience. So, to wrap up, I like these and the flexibility they give you they just aren't perfect. Still recommending.
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