I use a Coleman rechargeable blower, its small and will blow up a 16ft kat many times in under 4 min per tube. The cost is approximately 30 bucks. A few things i have learned about them;
1) the battery that comes with them is lame, get a new one with more amp hours from a battery supplier (~10 bucks)
2) you have to top off the tubes with a good pump.
3) you can have a beverage, get your tubes ~90% aired, & not be tethered to anything (other than your beverage) w/o braking a sweat.
5) it sucks & blows
4) did mention that the battery it comes with is lame?
"Suppose you were an idiot, and suppose you were a member of congress; but I repeat myself." - Mark Twain