Well it is NC Star honestly well made products through and through and just for $30.00 your getting a pretty good deal.
It isn't very large in terms of height about 1 foot tall, about 5 inches thick, and i am sure you can figure out the width from the description.
There are no straps inside it so understand your gear will flop and slide around inside it. The sling they provide or rather shoulder strap is not that long so you won't be wearing it like a book bag more like a back pack with only one arm through the strap.(Obviously)
The padding isn't very thick which sounds pretty common for half the gun bags out there. Best use for it aside from the obvious maybe use it with a rifle and fill it in with your extra gear or two rifles and fill it in with extra's like a chest rig, spare mags, BB's, and a tool kit.
Does What You Need
Short Shoulder Strap(Not really that bad)