those things are weird. :| Honestly I bought one pack of boys once and I was always too scared to pee laying down. I feel sorry for the little kids who have to wear those. Especially since they look like PAPER not like cloth so it'd be even more obvious then just wearing a goodnite.
From all the reviews I have heard of them they aren't worth it. Use this sample if you dare (they will almost certainly leak) then don't ever get them again. If you really want drynites/goodnites/whatever get the proper ones - the boxers aren't worth the packing they come in.
I have worn Goodnites several times. I don't wear then to sleep in because they do leak. But those pullups are mostly for little kids, like ages 6 to 12, who usually don't pee as much as older kids, like us teens do. I think they are made to hold maybe 6 or 7 ounces of liquid, if that. If I am wrong then someone please tell me.