I am a fan of the impromptu hunting blind. You can set up to hunt where ever you happen to be when you find a good place. And you can take advantage of changing conditions such as wind or barometric pressure changes.

For that reason I used to carry a square of camo burlap, and still do on occasion. But what I found is even better are a pocketful of 3" blanket pins and a product called the Hobo Hanky.

The blanket pins I open up and use like giant push pins to secure small leafy branches together to make impromptu blinds. They are also just darn useful to have around as well for repairs, etc...

The Hobo Hanky is a commercial product and is like a giant camouflage patterned bandana. It's about 42 inches square but folds up not bigger than a handkerchief to fit in your pocket, so it's a lot smaller and lighter and therefore more accessible than the burlap square. It can be similarly pinned or tied between trees or branches to provide a quick to set up and take down impromptu blind. There is a picture of a "pocket blind" on their web site.

With this setup I can put up a quick blind is just over a minute. That is flexibility. And if something changes I can pull it down and stuff it back in my pocket in even less time.

And in addition to using it as a blind, the hobo hanky has a million other uses, too. Like as a neck scarf, a head wrap like a shemagh for warmth and hiding your face, a bag for carrying your gear, a rag to mop your brow or wipe your hands, blow your nose, and so on. It also makes a great hobo bindle, which is what it was originally designed for, I think. :-)