Spraypainting a backpack?
 

Hey, so I have this Camelbak HAWG in UCP that I've had for 8 years or so now, and I love it. I just wish I bought it in CB.

What kind of spraypaint would be best in terms of look, and adhering to fabric(cordura) and also comes in a matte brown/tan color of sorts?

Yep I recommend Krylon as well. I had a regular civilian backpack in ucp which I painted. It can take a fair bit of paint though, as fabric tends to almost absorb it at first. Though ucp is a good patern to be painting over because its light. If you've ever painted something black you know how much paint that takes...

Tan base and brown dusting will make CB.
It won't be very durable though. I painted a whole cordura back pack in OD once... It looked dirty and the paint rubbed off on rough surfaces.
But on regular cordura gear, it work well.