I need to get a backpack that will fit my new custom rifle. Since I'm new to all of this I was hoping I could get some input as to which backpack I should get. I'm looking at the Eberlestock G4 Operator pack. Without having seen it in person, I'm thinking I can cinch the straps and restrict it so that it isn't too bulky. It sound like this has everything I will need to stow my gun, spotting scope, rangefinder, wind meter, shooting mat, PDA and everything else I'm going to need. Any suggestions?