The Parental Unit is taking long to be created, yet, I know that parents and Tom Bihn customers want the best, combine the two and the absolute best is expected.
Tom might have had a design all ready when he heard about a new fabric, somebody among the Tom Bihn crew or in the forum gave him an idea about something that needed to be tweaked.
For example, many parents now use cloth diapers and Lifefactory glass baby bottle, which is a whole different set up than disposable diapers and plastic bottles.
Some parents need a toddler and infant bag,others need a twin infants bag, some parents need a child, toddler and infant bag, others need a bag that accommodate multiples of one age and a child(ren) who is/are older.
Tom Bihn Inc creates bags for the widest population possible.
I also understand the frustration of expecting and existing parents who want an awesome bag to carry their children things.
Babies don't wait, toddlers move around fast, children learn and grow fast as well.
You all want a Parental Unit before youngsters go to college! :)