Thanks for the feedback. I need about 10 mats, maybe a little more, for use in the Indonesian jungle. Porters will do the inflating/deflating, so that's not a concern at all.
I need to lift them to Indonesia in my luggage (I have a decent allowance, so it's not impossible).
I have a few choices I am considering:
Inflatable mat – 183x45x7cm (one source says 183x49x7, but I guess 45 is more accurate), 20D rip-stop nylon, 300gram weight, 0.7 litre pack size, £19 http://alanrayneroutdoors.blogspot.co.uk/2012/07/karrimor-sleeping-mat.html
(I can also buy a mat of the same size from the same factory of 70D nlyon, hence 780 gram weight, and 1.8l pack size, for £16 – basically the same price, but a cheap product because of the weight – perhaps more durable?)
Self-inflating mat 183x51x3.8cm (width is tapered), 20D ripstop nylon, 605g weight, 3.7l pack size, £26
S-i-m 183x51x3cm (slightly tapered), 980g 6.1l pack size, £20
There are some other products I saw, bigger and more comfortable, but huge in size, so I think impractical.