Tom Harris of Airsoft Obsessed reviews the Hazard 4 Evac Plan B Sling Bag which is good for to use as bug out bag or for use in quick responses. We actually like the build quality and functionality of Hazard 4 Bags and some can be discreet as well even if you're packing a rifle. Sling Bag are for those who need to have a pack that allows you to quickly access or release the bag to get something inside, especially when time is of the essence.