If you’re looking for bifl bag I have to give the obligatory shout out to Goruck. The GR1 has molle on the inside that you can attach a holster to and I’m sure that some of the others do as well. It’s a pack that’s meant to thrive in rough conditions and if you happen to damage it it’s covered by their scars lifetime warranty. I’ve had mine for 7 years now with no issues. The only Velcro it has on the outside is for a patch and I’m sure you can remove it if you don’t want it.