I do not want to try and get you to suck eggs however this may be useful to many who like to wear disposables.
The content of the diaper - apart from wee and actual size differs on the amount of absorbancy ability. The more absorbancy the more expensive the garment will be. I am informed that the ingredient used is the same used in garden plant granules that absorb water and is mixed with soil to maintain moisture. It is Very expensive!
However whatever make you use it is important to do the following. Remove the diaper from the pack and gently fold longways and massage gently (from the outer) up and down the length of the diaper to ensure any creases and folds are smoothed out.
After you have done this apply the diaper pulling up into the crotch and stick the lower tabs first. Then apply the upper tabs. Left then right so it is comfortably tight. The diaper should then fit comfortably and snugly allowing it to be used ad intended and without sagging or to some extent leaking. That is where the extra insurance comes in - wearing plastic pants/pilchers
I hope this makes sense!