Frugal Design, huge interior

Actually I only wanted a bag in which I reinbekomme my clothes when I need in the field again. But I was surprised.
From the outside the bag looks unassuming and relatively small. But the interior is huge. Space without end. In addition, the bag is extremely durable.
I'm curious how this makes the bag in daily life.

In summary:

+ Extremely large interior
+ Extra ventilated pocket for shoes
+ Large outer compartment for small items
+ Robust material

- To solve shoulder on only one side
- No small pocket on the long side

All in all, the bag is great