R
Rebecca 750mL flask, 28mm fittings, 6" straw.
Absolutely LOVE the weight of these items and the seams on the flask look super sturdy. Its a good thing because it took me awhile to get the straw connection seated correctly. Theres an o-ring in there that likes to pop off during the straw insertion. But,once connected.....all our water belong to us! I put back pressure (within reason) on the unit and zero leaks! I love how the straw has a relescoping lock so I dont have to employ my hands or have tiny droplets spraying around/on me as I run. The straw pivots easily in its receiver for better orientation once its installed.