The slick sided version is from Texas Hunt Co, but I prefeer the molle version from SpecOps Brand. Different brands from the same company, that's all.

I have a SAW ammo pouch on each side of my THE, with a pair of nalgenes stuffed in each one. They fit nicely, and while it does make the pack more expensive, I think the pouches should have been there in the first place as a part of the pack.