IMHO- Comfort and accessibility is first and formost, you've got to be able to sit on the cushion for hours without your backside going numb and be able to gain access to your 37 different calls you will carry.(if you dont have that many now, give it time). Just try them all on and see what suits your needs- Personally I dont like them big and bulky but it must have plenty of pockets- I prefer the shoulder straps versus the full vest types that wear like a sleeveless coat cause it stays pretty hot here in South Louisiana-
Just my opinion