Project L'eroica 'vintage' water bottles

^Exists, but doesn't look retro
http://www.sjscycles.co.uk/fuel-bottle-cage-for-use-with-sigg-bottles-prod11261/?src=froogle

I'd wondered about debadging & Duffing up Sigg Fuel bottles

and crafting corks.

In the end I plumped for a NOS REG Isolated Bottle (£10 from Dave Marsh)
Unfortunately it's only 0.25l so I'll have to take a hipflask in my back pocket, but it'll keep the squash nice and cool and most importantly it looks the part!

My Sigg, which i use mainly for climbing/hiking etc has its own thermal jacket which would be great to use when out on a long ride, if i had a cage for it. Otherwise it gets stashed in the backpack.
Has anyone ever made a cage for a thermos flask? That would look amusing.