Previously posted USB concept prototyped:
No rigid elements inserted, so bag is too soft. In the next prototype may be used keder in the seams or sheet plastic in the flat parts.
Rear side of utility slot:
Front side of utility slot:
Both sides of utility slot:
Inner latch of the lock must be whippy, so a piece of plastic was inserted:
Pockets on the rear side of front compartment:
Rear side of the front compartment, also front side of utility slot (see foto above):
Utility slot opening step-by-step, take a latch:
Pull a latch:
Latch fully pulled:
Insert hand in the opened slot:
Pulling out a contens:
Blue book in the front compartment, screwdriver in the utility slot, red book in the rear compartment:
On-figure view photo is lacking, maybe later.
Well, my impressions are poor due to softness of the bag. Foam can be used, for example. Therefore utility slot itself will be better closed and hidden.
May be D-ring are preferrably be placed on the sides, or on the bridge (bulkhead forming bottom and sides of utility slot).
More stiff material, as 1000 cordura on inner walls while on outer 500 acceptable.
Howbeit, my plans on the next prototype are very distant. My current commute is undertaken with backpack only.