Anyone use the F5 Switchblade or S27 Little Trick to carry their AR pistol? I’ve been using a 5.11 sling bag for my AR pistol when i head out to the farm, but is becoming very worn. Collapsed length is 18.5”

I haven't used either of those, but I've had a couple larger Eberlestock backpacks in the past. Exceedingly high quality, but also bulkier and heavier due to being very overbuilt.

Vertx also makes extremely high quality bags as well, and they have a number of different options for low profile PDW bags. I use a Vertx Gamut for my CZ Scorpion Evo.