I was wondering if anyone had any thoughts on the Sigg aluminium boxes as vessels for boiling water (in an emergency). I ask because they are described as not for cooking, but I don't know if this is because the heat might warp them or damage the outside coating (or some such relatively minor concern) or because some joints will fall apart or something will poison the water.

Any comments welcome...

(An alternative option is to pack my semi-EDC "extension kit" into a 1 litre (32oz) Nalgene bottle, but the mouth isn't quite wide enough to get in the AMK heatsheet without repacking. And clearly, you can't boil water in the Nalgene by conventional methods.)

Thanks,

eeph