Processing / material:
First class! Very robust brand zippers, extremely thick and resistant outer fabric (which also is water repellent yet - light rain is not a problem). The seams are top handles, attaching the shoulder strap made of sturdy metal. Full marks.
Benefits / Ergonomics:
There are two particularly important advantages of this bag:
1. Easy access from above: you can access it from the top directly on the camera by a (well-protected) zip without the Velcro (which can be hidden) to open or the two plastic fasteners.
This is super fast and even goes on the run.
2. The removable inner bag:
The very rigid inner pocket can be removed with one hand and then the whole thing can repurpose quickly to normal messenger bag.
In addition, you can easily grab the photo equipment in the removed inside pocket and then use a whole in the messenger bag. Conversely, of course.
Padding / protection:
The cushioning is very good, all equipment are well damped against shocks and thus protected.
It's also nice the water repellent soil - so you can pocket sometimes settle on a wet floor.
Space:
In my Tenba Messenger size S following pieces fit:
- Olympus OM-D EM5 Body with attached battery grip
- 5 lenses (7-14mm, 20mm, 25mm, 45mm, 45-175mm)
- A Yongnuo YN 560 III
- Lightning remote control
- The small slip-camera flash
- 4 spare batteries
- Power Bank
- "Booklet" for 8 SD memory card
- Mini table tripod
- Bellows
- Charger
- Kindle e-book reader
- 0.5l PET bottle (or optionally a second Yongnuo YN 560 III)
- Mobile (Smartphone 4.5 inch)
- Various odds and ends
Anyway, I'm very very happy with the bag, and I will not give up so fast.