I realised just how big this backpack is when I sat with all my Sony gear, and was able to place the interity inside, and there still seemed to be ample room. Just as a test I popped in my two Sony A7 IV bodies, a 14, 24, 35, 50 and 85mm lens, 200–600 with an A7 IVs attached, a Godox V100, a few Lee filters and holder, a Jetboil, bottle of water, a few snacks for both myself and the dog and an all-important rain jacket, a towel and a few other items before the backpack seemed completely full.
There’s no doubt that when it was fully loaded, it was extremely heavy, but as this was a test to see how much this thing could hold, I carried it out of the van loaded it in, and was glad there were so many grips and handles around the bag so it was easily manoeuvrable. Once in the van, I then drove with the dog to our usual location and went for a brisk one-hour walk. Halfway through, I was absolutely exhausted due to the weight, but when it came to the comfort of the bag itself, it was surprisingly well adjusted, and I had spent some time prior to venturing out making sure that the fit was absolutely spot on and carrying that full load ensured that the waist strap and chest strap were securely tightened.
Once I’d done the loop, got back to the van, had a rest, driven home, emptied the backpack, readjusted the kit load, and then headed out the following day with far less kit and a more realistic load, a 200–600 with an A7 IV attached and a 24mm lens. I’d also popped in some filters just in case and attached the Alta Pro 3X to the bag. I also added a bottle of water and some dog treats, and that, to be honest, was it.

That load was far more comfortable to carry, and, making sure all of the straps were properly tightened and adjusted, we once again set off.
Looking at the adjustments to the shoulder straps, compared with some lighter backpacks, there’s far more adjustability, resulting in a truly comfortable fit. You can even pull the pack closer with two top straps, and adjust the back length, which is essential for very heavy packs. There’s also ample padding around the hips on the waist strap, helping to distribute the load and reduce the weight on your shoulders.
Again, the chest strap also gives you plenty of adjustment flexibility, and once everything is in place, despite the bag still being quite heavy (it weighs 3.6kg before you even put any weight into it), it actually feels quite light and easy to carry.

Setting off on a slightly longer walk, the backpack really did come into its own. Despite its size and weight, the load is evenly distributed, and the air system, back, harness, and waist belt make for a much more comfortable carry than expected.
It is worth noting that the size of the pack you can venture out with on a day-to-day basis, and having that huge cavity ready to hold your camera with an oversized telephoto lens. It is large, so if you’re thinking of a backpack with quick access to the camera, the size and weight make that difficult without putting the backpack down.
Venturing out into the wild with the backpack on a few occasions, I also used it just to transport a huge amount of kit, in place of the usual roller bag I would normally pack full of lenses, cameras, laptops and everything else I need on a job. However, here I can fit pretty much exactly the same kit in but with a few more pockets and dividers that just help keep things a little neater and what I did really like was that when handling the bag there was plenty to grip onto and it felt like everything inside was really well protected just like with the roller bag, but I had that added advantage that I could pop it onto my back and carry it, whereas that’s near impossible with the larger roller bags.

So when it comes to transporting loads of kit, especially large 1200mm telephoto lenses, this is a superb option. Even if you don’t own a 1200mm lens and you just want a huge backpack to store all your kit when you’re going off on an adventure or expedition then again this backpack is an ideal solution however there are plenty of other smaller backpacks that should suffice for most use and obviously with the Alta Sky ranging in sizes there’ll always be an option in this range that will fit you and your kit.