Will this idea work?

Hey guys, so I'm looking for some cheap weight this year to put in the boat for wakeboarding, last year I did 400lbs of sand in the bow, worked great, except it is always there. And I can't afford fatsacks this year sooo here is my idea. I was thinking taking a towable tube and putting a fatsac connecter on it and using a portable ballast pump to fill and drain it. I know how to put the fitting in and all that, and tubes are air tight so it shouldn't leak water, but I'm wondering if the force of the water will burst it. I mean they can handle 2 200lbs people bouncing up and down goin 40+ mph lol so there is some strength. I have a tube laying around but just curious If it would work. Let's hear some feedback on this please.