Military Surplus Canteen Cup

There are two types of GI Stainless Steel Canteen Cups:  One has a fold out handle and newer styles feature a butterfly handle.  Canteen cups have a 24oz capacity., and fits under all one-quart plastic canteens. 

Functionally we like using the fold-out canteen cup more but they don't stack for storage, so that's probably why the military started going towards the butterfly handle.  Also, probably because they were cheaper to make.

A Butterfly Handle That Can Extend Out 2 3/4" And Has A 3 1/8” Hand Opening To Ensure A Sturdy Hold G.I. Canteen Cup Measures: Top- 5 1/4” X 3 1/4”; Bottom- 4 1/2” X 2 7/8”; Height- 3 3/4”