I was at a hunting expo in Mobile, AL. last month and came across this blind. It seems to be exactly what I have been looking for to go over my ladder stand! It also doubles as a ground blind and can be used for a climber as well- just leave it attatched to the tree at yourdesired height and climb down at the end of your hunt, leaving the blind hanging, ready for the next hunt. They have 2 models; gun or bow. GREAT IDEA!
Has anyone used one of these yet?

WWW.thechameleonblind.com