If I remember correctly it was the price that set me off of the Wild Thing. If somebody is dropping $400 for a blind then I think they could put together some type of pack for a somewhat less expensive price to carry it.
I have been struggling with issue all season. Try carrying a backpack, blind, two chairs, a deer decoy and a five year old across a creek and up a small mountain. It isn't as much fun as you would think.
I partly remedied the situation by buying to folding chairs that fit neatly inside the blind case (Cabelas folding stools inside a BGT Groundmax Eclipse) but being able to somehow secure my backpack to the blind or vice-versa would be a real Godsend.