To be honest, almost all of the photo type backpacks, drone specific ones as well are utter garbage. They all feel like you have strapped a brick of foam on your back. They universially have very poor ventilation for your back. Your back is essential to shed heat and moisture for cooling when hiking hard. I am a professional geologist. We hike all the time, not little jaunts on park like trails, but rather in hard rocky or wet jungle environments. Typically I will hike 5-10 klicks a day. As of late I have been bringing the drone to help locate spots I may find interesting. I have always brought camera gear. Documentation is very important to our profession. So we obsessively shoot photos. The drone has added a new dimension. I have tried all kinds of backpacks, from Lowe to WYNRD. They all feel awful. I settled on using Domke Photo wraps. They come in 3 sizes and I can wrap the drone up safely and insert it in any decent backpack. None of this overpriced foam block stuff. The other thing about these backpacks, they encourage you to bring way more stuff than you will ever need in the field. Every gram will feel like a kilo after 5 klicks. Aside from that, they are cheap, only a few $$ each. Other brands have started to make them as well and have roughly the same features, nylon covered exterior, thin foam layer, velcro tabs. I wrap all my photo gear, usually just a Nikon D850, one macro and one wide zoom, now plus the drone and stuff, geopick, water and a small human repair kit. Stuff it all into my Osprey backpack. It has excellent suspension and unsurpassed ventilation.
Don't let the marketing types lead you to believe you need something specific for a drone. They are sensitive, but not so delicate they need level 5 protection. I almost never fall and if I do, the drone is the last thing I am worried about if I do. Besides most of those bricks folks are strapping to their backs are as likely to hurt you in a fall. Think wrestling, where the big beefy guy tries to snap a back over his knee.
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