Extremely comfortable, almost the perfect companion for any long hike. It made a huge difference on a 12-hour hike. However, the material of this backpack is too thin and does not withhold the rough elements too well. I live in a dessert like region and nature around us is rough; full of bushes with big thorns that puncture everything and sharp rocks that scrape everything, yes including your butt. This backpack is not design for this, it's more for a friendly hike in the woods backpack. I love how the weight is distributed; the back support is amazing; definitely a game changer for long hikes and ageing bodies...but adidas please invest more in tougher materials. Example cowhide or crazy horse leather on the bottom sides to ensure protection would be great. I used this once so far and it already has holes on the bottom and sides. I need to take this to a seamstress to get it fix, it's a well design backpack, not very practical for adverse terrains. Price was fair on sale, I would not pay regular price for this.