All the negative reviews here don’t make any sense. «0 friends» «Joined August 2012» 1st review is a negative review? 2nd review is also a negative review? I have the smallest version of this backpack which is the«sling“and have found it to be very useful not just for outdoors and extreme sporting events, but also for my everyday use. I have taken this backpack to go snowboarding, hiking, traveling, and even to work to charge my phone and/or laptop. This backpack has been through the storm with me and it has been working/looking just as strong as when I first got it. The material on these backs are very genuine and solid. The abrasion proof material really kept it from ripping or looking like it’s been worn and torn when I would fall on my back during snowboarding or accidentally dropping it during my hikes. The solar panels are very flexible and work REALLY well. Imagine charging your phone/ipod with your car but a little bit stronger. There is also a battery pack within the backpack to store power which isn’t heavy at all. On top of that, these backpacks also have camo packs, lots of pockets and storage compartments, and lots of straps to hold your equipment. I think the pricing is very reasonable, especially for the sling that I have. You can look up other hiking/outdoor backpacks and most of them go well over the $ 200-$ 250 mark and that’s WITHOUT everything that’s included in a Zentreks Backpack. I don’t mind paying a little extra for solar panels, abrasion proof, memory foam cushion, easy access compartments, and solid material to have this backpack last for years. It is a high-quality backpack and the Ho Brothers are very nice down to Earth people.