Size would be determined by the fish
you will be after.
I have a big one, that I barely use,
cant really travel with it, and only use
when I go to very specific places.
If I travel, is so much easier for me to take
inflatable floats, if I am after some fish with
tender meat, I will use some smaller floats.
But, then again, you never know what you will find,
so you will have to make a guess acording to either your
own experience or someone who has been there and done that.
I think a few Rob Allen floats is a good buy, they are not too
xpensive and they work great.
There are many inflatables on the market, omer, Riffe,
aimrite, ect.