Check out Cabelas online, look for Cabelas Dove Shooters Stool and also Cabelas Dove Shooter Chair if you want a back on it. I have a very old one that I use in blinds when archery hunting, works for long waits in photography too. Mine has a pouch that stores small items in it as well.
These type stools/chairs are super strong for the weight, very light, the tubular legs won't sink into soft ground. They have a carry strap, fold flat and easy to carry. The only problem I've had is aluminum tubing can create unnatural noise when rubbing against stiff brush and will alert some animals like Whitetail deer, they DO NOT like the sound. These chairs are so light you will not notice the weight at all.