I'll make this quick: this is the best middleweight backpack I've found for photography so far. It's not the fastest or most rugged, but it's the most versatile and comfortable. Let me explain.
As I've made clear in a previous post, nobody makes the perfect bag. It's a fools errand because "perfect" is subjective and what works for one is completely inadequate for another. However, the more modular a bag is, the better chance for it to become all things to all people by allowing all people to adorn it with all things to meet their needs. Looking further into this idea, especially since Peak Design's recent release of a fully redesigned bag lineup dubbed "v2," I've realized Peak Design is great at making accessories that meet the needs of most people but wrap it all up in bags that don't. Take their 45L Travel Backpack... it converts into a duffel with a forward facing, wide-mouth, zip opening. It's really not great for anything but a duffel bag that turns into a half-assed backpack for longer distance carry, especially for outdoors. However, for camera carry within, they've created camera cubes with efficient padding, mindful access port placement, an abundance of attachment points and durable exterior skin sufficient enough to be used on its own. A quick check of the external dimensions gave me an idea as the camera cube is nearly spot on with the dimensions of Shimoda Designs' large Integrated Camera Unit (ICU) for Explore and Action X backpacks.
Usually, Kickstarter is a collection of scams and bad ideas for internet virgins to be separated from their money. Sometimes, if you know what you're doing, it's a source for good deals. In this case, Shimoda Designs has established itself as a reliable maker of durable, action oriented camera backpacks. Shimoda decided to use Kickstarter as a "group buy" for their new line of Action X backpacks and mine managed to arrive just after Xmas.
A week before the Fremont hike, I grabbed a Shimoda Designs Explore 40 kit from Glazer's Camera. After transferring my gear from the LowePro to the Shimoda, I weighed it and it came out to only 24 lbs. Once I fully loaded the pack with extra clothes, food, water and the extra photography gear needed, it topped 42 lbs. Despite the extra weight, and with a pair of hiking poles, I made it up and down the mountain with my back in far better condition than the previous 2 weekends.