Our 28mm Flip Cap is a great upgrade to our Stow bottles and SF150 Flasks. The redesigned cap features a cover to keep unwanted dust or bacteria out and a valve for high flow and easy drinking. However, not all year generations are compatible with the cap.
This guide will help identify which models of Stow / Softflask are compatible.

Compatible Models - Below shows sample Stows / SoftFlasks that are compatible
See below for more details.

2020 Stow Bottles - Our 2020 Stow Bottles are compatible but our 2019 models are not.  To determine if you have a 2019 or 2020 model, look at the back of the Stow and find the Filter Compatible Icon.  If your bottle has this icon, then it is compatible with the 28mm Flip Cap. If the FIlter Compatible Icon is not present, the 28mm Flip Cap will not fit properly and is not compatible.

Softflask 150ml  - Identification on our SF150 Softflask is a little more difficult but it can still be determined by removing the top cap and taking a very close look at the threads.  To identify if your softflask is compatible, look for visible markings on the threaded nozzle of your flask:

Raised features circled above indicate that your flask is compatible.  If the markings are not present, then your flask is not compatible.

Softflask 250 - Unfortunately, the SF250 is not currently compatible with the 28mm flip cap.