I bought one red and one blue for each of my children.  I keep a spare set of clothes (pants, shirt, socks, undies for the oldest and a diaper for the youngest.)  It fits everything I need for the spare set (20month old and 4 year old) and its' color coded for each boy.  I had been using other bags and zip locks but this is the best by far.  I can toss them in a beach bag, backpack or the car.

They are sturdy and well made.