If you don't want leaks, don't pee in your pants!
Much of the above advise is helpful A thick or bulky diaper is nice, but when saturated, all the extra wetness has to go somewhere, so the best thing is to change more often. I have worn both cloth and disposables and the bulky disposables will last a long time (which is why I wear them) and worn thick cloth as well, but when soaked, yes, they leak It happens.
Options for this, as said, better plastic pants, or add a booster to the inside of what you are wearing, or just change more often *shrug* Tucking the leg bands up inside the diaper item you are wearing helps a lot also. this encases the fabric and doesn't allow 'wicking' through the leg bands, and helps avoid leaks, but what will happen is al the excess pee will just puddle up in the pants and start sloshing around, and come gushing out when you sit...Now THAT will be a leak! So you are more then likely just better off changing more often..
Have fun!
OH! and I have seen those training pants with the 'zorb' in them and am intrigued by them, and want to order some at some point..I like trainers and would like some that work well, that I can have an 'accident' in but will hold everything and not get my pants wet I have a few pairs that are fairly thick, but will 'wick' from inside out and my pants get wet after a while, which is 'barassing and well....you know people would know what I did
they just wont know how good it feels!