In the past I've provided individual Kata bag reviews in this forum (links are provided at the end of this review), but now that I have all of their bags in their "EPH System," I decided to do the following systems review. This should be rather unique, as most of you probably haven't seen such "systems" approach to carrying photographic gear. For some, this might turn out to be amusing at best; for some, a degree of curiosity raised; and for some, your need being met. Whatever the case may be, here it is for your enjoyment! (Photos below are courtesy of my 11 year old son.)
What is Kata EPH ("Ergonomic Photo") System?
While all Kata line of bags are designed for single bag use, some of their bags are also designed be used together in modular, ergonomic combination that provides comfort, flexibility and extra storage.
The Kata bags that can be used in this innovative modularity and shown below, are: 1) R-103 Backpack; 2) T-214 Torso-pack; and 3) W-94 Waist-pack. Each of these bag is Kata's latest. The earlier and older model bags can be used as a system, as well. These bags come with linkable clips to conjoin one another.
Who It is For?
It is for those who need to carry more than what one particular bag or two can hold. It is also for those who desire flexibility and creativity in the way they want to carry their gear.
The Whole System - Side View:
The Whole System - Side View with Waist-Pack on Back:
The Front View:
The Back View:
The Torso and Waist on the Back Combo:
The Torso as "Sling" and Waist on the Back Combo:
CONCLUSION:
I love Kata bags. In fact, I now own 6 of their bags and most likely the number will grow. If you're like me -- 5' 8" and 155 lbs -- wearing all three bags that are fully loaded will probably won't get you very far on your hiking destination.

Review of R-103 and T-212 (predecessor to T-214): https://photography-on-the.net/forum/showthread.php?t=114224
Review of T-214: https://photography-on-the.net/forum/showthread.php?t=566336
Review of W-94 is not available yet...

If anyone wants to see the conjoining clips, just let me know and I'll post some images of them...