I really really like backpack straps for gig bags, but they have to be hidden (and the D rings with them). It's just too easy to snag them on other things, which can rip the D rings out of the bag or damage whatever they've snagged on, usually when you're unloading things or hauling them up a stair.Watch the video - no backpack straps.
Mono doesn't provide a lot of storage capacity with their usual bags, so they make something called a "Tick" available (as a $100+ option) that uses external D rings on the bag and straps on the Tick as connectors. While at first it seems like a great idea, I can tell you from experience that it's dangerous to your gear and a major PIA and snagging hazard. Be extremely mindful about these things if you've got one on your bag.
