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Jethrow said..
Totally speaking out of my arse because I've never used one but I think that with the stitched construction they need a certain thickness to be kinda rigid, therefore there would be diminishing return the smaller you went?
That's not to say that I haven't considered one for larger sizes... ;)
I've thought about that before. There's two ways that an inflatable gets its rigidity: thickness and the carbon plate. Hard boards can get thinner without sacrificing rigidity if it's designed properly (hd foam and decent lamination scheme). The carbon plate should be plenty stiff and likely has a bigger overal roll than the thickness. Anyway, I hope that if the carbon plate reaches all the way to your front foot, you have a stiff surface to pump against.
All online reviews seem to be about big inflatables and how they are convenient but lack a bit of performance (less stiff in the pump and more sticky on touch downs and release). Maybe this conclusion doesn't apply to smaller inflatables because the carbon plate covers most of the board + you need to sink it anyway so slogging isn't an option (and the stickiness less of a problem).
at a listed weight of 4.2kg, this 45l board is a real contender for me:
reptilesports.com/gb/wingfoil-boards/wingfoil-board-inflatable-i-ufo-pro.html#/85-model_size-4_7_x22_x3_x45l