that's the heavy cover inc. canteen mess kit in titanium:
http://www.heavycoverinc.com/heavy-cover-us-gi-style-titanium-canteen-mess-kit-37oz-includes-tritan-plastic-and-titanium-canteen-cap. i remember you can just buy the cup and cover for $50'sh if you don't want to buy the canteen as well but for some reason it's no longer listed on the site. contact the owner and ask...maybe it's just out of stock?
the plastic nalgene oasis canteen fits in this cup as well and it's actually lighter than the titanium
if you want a stainless steel usgi canteen cup ($13 from that big river site) then this stainless steel cover from heavy cover will work:
http://www.heavycoverinc.com/us-gi-military-canteen-cup-boil-cover...i have both of these as well and it's crazy heavy - especially the cover, it's way overbuilt.
