What the heck is the difference?? I have both in my stash, and I have no idea which ones are which. <img alt="" class="inlineimg" src="http://www.mothering.com/discussions/images/smilies/redface.gif" style="border:0px solid;" title="Embarrassment">
Look at the inside fronts of your diapers. The 3.0s have the PUL come over the top and about 1-2 inches into the insides of the diapers. This prevents moisture from wicking out, and was definately an improvement in the design, IMO.