Buy It !!!!
I have owned the Camelbak Mule for years and this thing outshines it by far. The straps on this are padded and much wider, like a HD backpack. Very stable. Unlike the Mule, thin straps that are very uncomfortable. Now the best part - if you wear a full face helmet sometimes, you can strap the mouth guard and hold it. Regular helmets are easily held in place. The unit is large enough to hold a pair of 666 knee/shin armor AND elbow armor INSIDE the pack. If you are not carrying any armor, fine...just cinch down the straps.
Best unit I ever had.