In order to help combat this insert escape, Thirsties Duo Diaper has the same flap in front as its covers do. Just as the front flap helps to hold trifolded prefolds in the cover, the flap helps to keep the front of the insert secure in the pocket diaper. I love that I don't need to worry about the insert, whether I'm putting the diaper on or throwing it in the wash.
What a fine fluffy feature! Unfortunately it's difficult to get a good picture of this feature. If you are worried about inserts sticking out but you hate to take inserts out of pockets, then make sure to look for the flap on the Thirsties Duo.