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Extremely large, -slightly- difficult to fully inflate from 10m, but will get to 3/4 without much difficulty and can be orally inflated to full on the surface without much difficulty. Very visible. The dump valve on the piece I received was at the top instead of the bottom as in the picture, and entirely too small to be practical. Will probably be replacing the dump valve on it.
Really does make the Express Tech much more comfortable! Doesnt add much in the way of weight or interfere with drying.