I'm looking for a 16 ounce clear flask with a curved side so it will fit in the back pocket.

The GI flask is the right size but it lacks features I think are important.

First, the tiny cap and screws are inadequate for sealing the bottle from leaking. They are not fitted correctly and have no O ring.

Secondly, There is no loop for retaining the cap. Therefore I will loose it the first chance I get.

Does anyone know of a better product that will fit my parameters?

www.campmor.com carries a few flasks that may work.

I recently bought a GI flask, it junk it always leaks!

I have a couple of GI flasks that I have used for years, never had a leak. I don't sit on them tho, maybe that makes a difference.

Or maybe Uncle Sam has a new lowest bid mfgr who screws up (no pun intended) the threads or gasket...