The Kelty Sling Bag looks like a bag used by civilians but the inside reveals storage and organization for a tactical mission. The Kelty Sling Bag looks like a bag used by civilians but the inside reveals storage and organization for a tactical mission. Access to internal storage is fast and efficient but secure. The main compartment has a rigid back with loop-sided Velcro. This allows the user to customize the compartment with any hook-sided accessory.