Last year, I used my Aeronaute as luggage, left in the places I was staying and my S19 as in town carry.
My S19 is my EDC, it feels comfortable as in I don't even know I am carrying something.
But, I am trying to be ultra minimalist with the Tristar and I wonder if repurposing the Tristar Packing Cube Backpack at the destination would not be a good idea.
However, I will bring my iPad Mini and feel nervous about carrying it around, even in a Cache in the very thin Tristar Packing Cube Backpack.
Another solution would be to leave the iPad in a safe and only carry a smart phone inside my SCB.
A third solution is to carry the iPad Mini inside its Cache zippered into the Aeronaute Packing Cube Backpack held, along my FJN in a Large Shop Bag.
As a bonus, The Large Shop Bag expanding abiltity allow it to be used to the fullest as a retail therapy, farmer market, food truck goodies handler.
That third solution looks like the lightest and handiest, as I could carry my Tristar backpack style and Large Shop with SBC, FJN and iPad Mini inside its Cache as the second bag, on my shoulder.