i watched a program called dean macey, and they were fishing for catfish,
they were fishing really tight to islands and far bank, they were using a bait boat, but not with a lot of bait, agood pva bag would work i would have thought,
also considering they were fishing in summer.
so you dont need as much bait,
i have caught so many fish on the smallest of pva bags even in quite large lakes.
hope this helps.