Looking at the Mystery Ranch site it appears the TF-50 is on the Guide Light MT frame, which is the same as the Selway. The TF-50 is a little smaller. It has a capacity of 3,051 ci while the Selway has 3.783. If you attach a day pack lid you can bring the capacity up to 3951 ci. The material, straps, buckles, and zippers used in construction are identical. The two pockets on the Selway have zippers, while those on the TF-50 have elastic and are listed as water bottle pockets. Both packs are listed at 5 lbs. So basically the TF-50 with the overload shelf is a bombproof 1-3 day pack you can use to get in and get your game out. All that for $200.00.