Taking a real leather backpack on a hike or on a trekking adventure through the wilderness of mountainous trails, is but a fantastic idea that encourages you to step out of the modern world and into the wild.
In a very real sense you won't have access to all of the small conveniences of a modern style backpacking backpack that otherwise make hiking and trekking easier and much more comfortable. With a real leather backpack you will not so easily bare the weight of the heavier thick leather as you maneuver your way through the bush or make those long stretches of flat plain. Your leather backpack's internal compartment space won't be nearly as large or situated as a modern style hiking backpack, and you can count on things to get lost in there. As for being comfortable, forget about it. These rugged structured leather backpacks aren't designed to adjust well up against your back. Due to this, you're without a doubt going to take frequent breaks to rest your back.
But what you will discover, is that like times of old, the potential you possess to make the journey through tapping into your natural survival capabilities and being resourceful is ten times more enjoyable, rewarding and memorable. Get yourself an real leather backpack and take the "backpack with a real leather backpack" challenge.