I use one of the small 1 gal shop vacs. I got it at Walmart. What I especially like about it is you can reverse the hose and use it to fill your inflatable dinghy in about a minute. Done with the dinghy? Now use it to vacate ALL the air, allowing it to be folded and rolled easily.
Oh, and it vacuums great also.
Odyssey, '79 CSY 44 Cutter
Channel Islands, CA
"There is no unhappiness like the misery of sighting land (and work) again after a cheerful, careless voyage."