APO Military Shipping Boxes & Flat Rate Options

APO (Army Post Office), FPO (Fleet Post Office), and DPO (Diplomatic Post Office) are military and government postal designations that route mail to service members and officials overseas. Packages sent to these addresses must meet USPS postal regulations and, in many cases, MIL-SPEC packaging standards such as ASTM D5118 to ensure durability in transit.

Our Military Boxes and V3C Boxes comply with ASTM D5118, specifically the V3c and W5c weatherized corrugated box specifications. These standards govern water resistance and structural integrity for government and military packaging, making them suitable for APO, FPO, and DPO shipments worldwide.

Yes. We manufacture custom-sized corrugated boxes engineered to your exact interior dimensions. Custom sizing reduces void fill, lowers dimensional weight charges, and ensures a snug, protective fit for your items — critical for long-haul military postal routes where package integrity matters.

Both V3C and W5C are weatherized corrugated box classifications under ASTM D5118, but they differ in water-resistance treatment and construction levels. V3C boxes feature a coated, weather-resistant exterior, while W5C offers enhanced protection for more demanding environmental conditions. Our team can recommend the right spec for your APO shipping application.

We offer single-wall and double-wall corrugated constructions. Single-wall boxes suit standard APO shipments with moderate weights, while double-wall options provide added crush resistance for heavier or fragile items. Heavy-duty and MIL-SPEC weather-resistant configurations are also available for specialized government requirements.

Yes. Our military and government-spec boxes are available in bulk quantities, with minimum order quantities starting at 100 pieces for custom configurations. Bulk orders ship from multiple U.S. locations with standard lead times of 7–14 business days. Contact us at 888-333-9513 or Sales@cardboardboxes4u.com for volume pricing.