A quick video review of both the conceal backpack and the sling:
The Conceal backpack from the Brown Buffalo is a 19L backpack, in 420D Nylon is a well designed high quality backpack.
The sling
▶ Check out my gear on Kit: https://kit.com/pkshiu The Concealsling is a small sling bag by Brown Buffalo. It is compact, well design and has just enough organization to be a good EDC sling bag.
I also have a detail written review over at The Perfect Pack website.