The "back" (rear edge) of the Bush In A Bag has grommets along its edge for rigging it as a blind. I put a 1' length of cord through the far left and far right grommets. You can then pull the back corners of the Bush In A Bag forward, in front of you, and tie them together. This gathers the bulk of the poncho closer to your body and makes it much easier to move around, shift position and so on. If you want to move some distance, you can gather up the "skirts", pull them to the front, and tuck them up over the tied cord belt.
The Bush In A Bag is a very clever product.