Sturdy and does its job well.
The drinking cap is really convenient and fast. A small downside to not being completely tight. When the bottle is removed from the bottom of the bag, the cap leaks. No problem with the vertical position :)
The whistle works just like I thought it would work. You no longer have to unscrew the cap while drinking, you can just open the whistle and sip the drink.
If you buy a Wide Mouth bottle as a drinking bottle, also buy this one. The only downside is that being ‘closed’ is not waterproof.
High quality product and fast delivery!
Really good and convenient replacement part for a hydroflask drinking bottle!