20oz Stainless Steel Insulated Tumbler

I bought this tumbler so I could prepare my recovery (Fluid cinnamon vanilla!) shakes without making a huge mess. It definitely does the job! The lid fits securely and the little zippy section stays snug while I'm shaking up the mix. My only quibble - and it's absolutely not a deal- breaker, is that drinking from the tumbler would be easier if there were a little vent hole in the lid. Of course, a vent is counter to my "secure" and "snug" statements, so such a thing may not be possible. In all other ways, though, this tumbler is the bomb!