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Yep, I also just made one from an old closed cell sleeping pad - sewn together on 3 sides with dental floss. In fact, I made two, one for my cell/mobile (= phone, GPS, FM radio, mp3 audio & mp4 movie player, & pdf library) and the other for my camera. Weight was 8g (0.3 oz) each. Plus they fit nicely into the belt pockets on my ULA Catalyst. You can leave either a long or short side un-sewn, if you need to do stuff like connect a solar charger or some earphones at a particular side of the device (but don't step on a rattler listening to your tunes!). They're not field tested yet, but I can always duck(UK)/duct(US) tape them if they start coming apart.
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