Abstract: A shelter system is disclosed which comprises three central elements. A rotatable barrier element provides protection from incoming ballistic threats. The barrier functions on the principle of detonating, absorbing, and deflecting incoming threats away from a designated area of the shelter. A protective envelope element utilizes a compartmentalized vessel, two containment components, and a strata of alternating compacted fill and interstitial plate layers; the strata is enclosed within the vessel and two containment components. The interstitial plates serve a dual role in providing a compaction surface in the fill method and layering for the mitigation of ballistic threats. The design of the vessel permits each vessel to be filled while positioned flat on the ground surface; once filled and sealed, multiple vessels may be re-positioned in vertical, horizontal, sloped, or spanning arrangements.