I went to buy a stainless steel mug today and called into a local army surplus store. The mugs they have have been issued and are a little manky inside. They are the ones with wire-type handles that fold around the cup. The store was flogging them for £8.99 which I thought was a bit steep for second-hand grubby gear. So I was wondering, the titanium mugs in outdoor shops, like the MSR variety, are very expensive but at least they're new. Can you put those on a stove or/and a fire to boil up a brew?