Thermowrap!
I noticed that at my local Homebase, they would reduce a full roll by a third if the label was missing or it had a slight tear in it.
I bought a full roll plus the tape for £15 and it'll last for years.
Used a long length for under quilt in winter and works a treat.
The best use has been a cosy for my Nalgene bottle. Don't make a cosy lid though, fill with near boiling water, slip on the cosy then put in a dry bag in my sleeping bag. The cosy controls the release of the heat keeping me toastie all night and it's still warm in the morning making the first brew a lot quicker!
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I used Thermowrap to make my cozy's too. Works really well. As Widu says the silver tape degrades after a couple of days getting smacked around in your pack. Duct tape is just the the job.
