Over the years I've carried just about every kind of bag imaginable to the shooting range or gun shows, and I can tell you right now, there is no substitute for a good, very sturdy, well designed backpack. Those shoulder straps come in handy when you need your hands free.
After a lot of trial and error, I ended up with a Tumi backpack and it's perfect! Whether I'm out for a trip to the shooting range, attending a gun show or just stowing some backup gear in my truck, this one fits the bill.
Bug-Out Bag, Range Bag, Man Bag, Gun Bag or just my backpack, everyone needs one. What guys keep in their bag varies a lot. Here are just a few quick examples of things some guys stock their backpack with.
My backpack pictured here, has an external pocket for a water bottle. That tall pocket comes in handy often, even when I don't have a water bottle in there. It also has two heavy reinforcement bands sewn into the circumference top-to-bottom inline with the shoulder straps, a feature that made this particular bag stand out to me.