BackTpack 3 Ergonomic Backpack, School Bag, Healthy Back Bag

I purchased this to use as a book bag for college. I carry a heavy load and walk across campus five days a week & my back was starting to feel it. I did a lot of research for a bag that would help with back fatigue. "Ergonomic" backpacks seem to only shift weight around on your back & if you're lucky they add a little padding in there too.This is completely different. I never felt back fatigue, the shoulder straps do not cut into my shoulders - even with a heavy load. I can get to anything with it on, which is awesome! I don't have to take the bag off to get to stuff. It has everything a book bag has and more.It has every pocket size you will possibly need and those pockets are easy to get to.I never tried it on a bike or while hiking, but I can see how this would be perfect for those activities. It puts your center of gravity at your hips and does not impede your range of motion at all. Again, you have access to bag contents without taking it off. I would recommend splurging and getting the additional chest strap if you are doing these activities.Note - it will take a little getting used to. It's different than a traditional book bag or back pack to put it on & take it off. Remember: you won't be doing that as often with this bag as a regular book bag/backpack. It's different than other bags, but that is why you are looking at it.The construction is top-notch. It reminds me of the high-end, light-weight photographers bags. There wasn't a loose stitch or hanging thread anywhere. If the bag did get scratched or ripped, I don't think it would fray apart.I totally recommend this bag for anyone.