I've been wanting something like this forever. SplitStan's Cup Divider fits my Stanley perfectly and keeps my cold brew completely separate from my water. Life-changing for my morning commute.

We both use our Stanleys all day long so I grabbed two — pink for me, blue for him. No more mix-ups and we can share the cup on road trips. Such a smart little product.

Honestly thought this was a gimmick but it genuinely works. Slides right in, zero leaking between sides, and cleanup is super easy. 10/10 would buy again.