Looking for a supplemental "battle bag"
OK so I have been actively building a Get Me Home Bag (GHB) and a Bug out bag (BOB). I have decided to throw in a third bag to my equation. I am looking for a Battle Bag/Active Shooter bag. It will mainly hold spare shotgun rounds, spare pistol mags, and spare AR mags, maybe even a spare fighting handgun. I want this bag to cut down on wait carried in my pack style GHB and BOB. I need something with an over the shoulder style, in case I have one of the packs on I can sling it and go. I have looked at the offering from BlackHawk and 5.11 and Maxpedition. I dont wanna break the bank, as this piece will primarily ride in my truck and/or SUV, and see any real use day to day.
I am a probation officer with a mixed load of adults and juveniles. I am in and out of our local schools all the time. We have no School Resource Officers in any of our schools. I came to the realization during an incident the other day that there is always a slim possibility that I could be the "first responder" during an active shooting or any other critical incident. This is a very slim possibility, but one I have to be in the mindset for. We have 6 high schools, that range from in town two minutes away from a police station, to very rural with a 30-45 minute response time from LE of any kind.
Can anybody recommend a quality value bag of this type?