I just got the starter pack of Goodnites Trufit. Overall, they are a little snug, but they don't cause any lines on my body, so they are not too tight.

After testing out (both ways), the pad insert holds a decent amount, and it actually held ALL of the pee when I wet it while sitting down, and still held another wetting.

As for messing, the trufit does just as good a job as Goodnites diapers for holding the mess.