Review on Eberlestock Mainframe Pack: Optimized Backpacks and Versatile Daypacks by Sam Faucher

I have yet to carry a heavy load with this backpack but I'm sure it can handle it. Like all Eberlestock bags, the quality is top-notch. This is the fourth Eberlestock set I've bought. Update: In December 2016 a hunting buddy of mine caught a very large moose with a rifle. After 4.5 hours of field dressing we grabbed him down the hill. It took 3 rides and I was carrying about 70 pounds on each ride (I'm 170). The backpack was durable and didn't slip. Straps allow you to securely fix the load. I have since also purchased the F2 Transformer which works great with this pack. If you take an animal with you, you can transport meat between F1 and F2. Definitely a great system.