SIS Camera Bag is light (it is filled with polystyrene and plastic pellets and weighs only about 1kg). It comes with a shoulder strap so carrying it is also easy.
The anti-slip base keeps the bag in place.
Remember the three S’s of a great pic with a big lens: Stabilise, Stabilise, Stabilise!!
Also perfect for stalilising your spotting scope when setting up a tripod may take too long.