In reply to Dave the Rave:
> Perhaps you've cracked the foam that insulates them? My first Vango had this. I just thought it was a crap flask. They're not unbreakable.
There is no foam in stainless steel flasks.
3leggeddog, you must have lost the vacuum somehow, but weird it has happened lots of times. I still have my 20 year old first steel flask, it is really bashed up but the vacuum is still intact and it works OK. It has one dink in it where I think the outer wall now touches the innner wall and it get warm there, but otherwise it still is OK despite all the dents.