@Rambler358 I like the backpack that came with the Karma package. FYI: I think you can configure the case to carry up 5 batteries (space for 4 + 1 mounted) if you're not carrying extra blades, grip or charger. So, you need to balance things out. For example, do you really need to carry the charger with you if you are on trail? Im using a small toolbox to carry extra stuff (mounts, accessories, batteries, to support additional go pro cameras for a multi camera setup). I tend to keep that gear in the car, and the flight gear in the pack.
Note 1: unless its a short walk, I tend to remove the blades prior to storage or hiking. (The foam in the case appears to put some (not a lot) of stress onto the arms & blades. I wouldn't want to run with the pack if the karma still had the blades on )
Note 2: Save and use the box that the original blades come in. The box that new blades come in is like 1/4" or so bigger and doesn't fit into the space in the case that accommodates the original box of blades. The original box can easily hold 3 pairs of blades -- the box buldges a wee bit with 4 pairs of blades. The original box is kinda flimsy, so I dont know how long it will last.
Note 3: I use the little foam "U" shaped wedge that holds the camera -- it keeps camera/gimble from fluttering around in the case when moving.
Note 4: Save the box that the extra battery comes in. I use it for storing the battery in the tool box between sessions.