It’s a pouch. It’s a pack. It’s the S.O. Tech Expanding SERE Pack (ESP).
In pouch form, the S.O. Tech ESP docks to any MOLLE compatible platform. If the need to carry additional items arises, it zips open to convert into a back pack. The pouch has 2 zippered compartments that remain useable even when the pack is deployed. These pouches could be filled with small survival and first aid items that would be accessible whether the bag was in pouch or pack configuration.
S.O. Tech tells me that the ESP has been in development for around 4 years and it should be available soon. The picture shown, may not represent the production model. Check out SpecOpsTech.com.
While you are there, check out the killer deal they are offering on their low-profile URP-S.