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I bought the 4 fluid oz (approx 120ml) version of this to carry methlyated spirits for a
TOMSHOO Outdoor Titanium Alcohol Stove
. The stove itself holds 2 fluid oz for about 20minute burn time but it doens't have a lid so the practical option is to burn to empty. This then allows me two decent length boil times for drink plus meal rehydration in the great outdoors. The nalgene container isn't the absolute lightest way - or cheapest way (obviously) of carrying the fuel but as the chance of fuel spill in my pack is unacceptable, this is an excellent way of carrying a small amount of burning alcohol in relative safety. It really doesn't leak, is reassuringly solid and its easy to see how much of the purple-tinted meths I have left.
Obviously, now I've got meths in it I won't be using it for anything else but it could be ideal for other small quantities of fluids for travel / backpacking. Note the 4oz is too big for the air-travel 100ml per item restriction.
It takes marker pen reasonably well too so I can label what I've put in it.