This is a great, roomy bag for the whole family that is perfect for the pool and beach.  It fits four towels, snacks, kindle, diapers and sunscreen.  Works for me!  LOVE it.

Update: We are in our 3rd summer of using this bag, and we now have a second child.  It is STILL my favorite beach bag, and I get so many compliments every time we take it to the beach or pool.  This is a must have for every active family on the go! Oh, and I forgot to mention that it has still kept its shape and looks brand new after years of use and travel. (Even when traveling overseas, I stuff this bag in my suitcase if I know we will be going to the beach.)