My ideal backpack would accommodate storing my iPadMini2 clipped with the RC as one assembly. Since the iPad is a tight squeeze into the RC clips, it's kinda difficult to assemble and disassemble. It would be much easier if I could leave those two things mated together. This reduces the time to fly and speeds up the effort to pack to leave (as the police are arriving to arrest me for flying...Hah!). I haven't found the ideal backpack yet, but this below is close to ideal, IMO. However, I'd really like the lid interior dedicated to holding the iPad/RC in the padded pocket with a velcro access flap. If this backpack below had such a pocket in the lid, that would be a perfect backpack. For now this backpack works pretty good to meet most of my goals. I simply leave the iPad integrated with the RC and lay it on top of the padded flaps, with iPad facing down against the padded flaps, on top of the Mavic. I position the ipad at the bottom of the pack, so when the lid is zipped closed, it's at the bottom and can't fall any farther down, since it's not actually in a pocket.
Here's the pack without the iPad/RC, showing I still have lots of room for other things, like an point and shoot camera, or an Osmo mobile (both fit).
This photo shows how the top flaps open up to access the Mavic. It also shows the side pockets that hold extra batteries (there's one on each side)
This below is how I lay the iPad and RC on top of everything, and just zip the lid closed. This provides very quick access to the RC to turn is one and launch the Go4 app. I know this doesn't look too organized, or clean, but it works and I think the protection is adequate. Ideally of course I'd like the iPad/RC assembly to be in the lid, within a pouch that has a formed insert, specific to this iPad/RC shape.
This is the bag zipped up. It has 3 more zipper pockets on the outside of the lid, which carry things I rarely need access to like spare props, lens cleaner, lens rag, car charger, USB charge adapter, etc.
The backpack is relatively small, about 11.5' wide. My hand has a 9' spread. The backpack filled weighs 7.5 lbs as shown, with MacroPolo tracker, charger, iPad, RC and SD case and two extra batteries.
Outer Dimensions: 11.5" x 7.2" x 15.6" | Inner Dimensions: 10" x 5" x 14.75"
This backpack is quite inexpensive,
$27 from Amazon. Although it's not exactly what I want, it's the closest I have found for space and utility. Roomy and convenient.
Oh yeah, one of the best features of this backpack are the zippers. These things are the smoothest zippers I have ever experienced, almost too smooth. They literally fly open! The materials quality is pretty good to, but it doesn't have a padded handle, it only offer a grab strap which is not a comfortable when hand carrying. But at only 7.5lbs, it's acceptable.