| Impact Absorption | Closed-cell foam structure decelerates shock before it reaches the lens or body. When tested against MIL-STD-810G drop protocols (1.5m concrete, 6 faces + 4 corners), the EVA cavity keeps transmitted shock well within safe limits for precision optics | Hard shell cracks or transfers 100% of impact directly to gear. | Zero structural protection — fabric collapses on impact. |
| Custom Moldability | EVA can be hot-pressed into any 3D shell shape and die-cut to ±0.5mm cavity precision. Lens barrel channels, anti-rotation ribs, accessory trays — all molded in, not glued in. | Requires injection mold tooling; cavity inserts are afterthoughts, not integrated. | No molding capability at all. |
| Lightweight Strength | EVA density 60–85 kg/m³ delivers compression resistance ≥ 90 kg/cm². A full-size DSLR EVA case weighs ~400–600g — approximately 40–50% lighter than equivalent-sized traditional hard cases (e.g., injection-molded polypropylene). | Heavier for equivalent structural strength; hard cases add 200–400g dead weight. | Lightest option, but zero crush protection. |
| Water Resistance | Closed-cell structure is inherently water-repellent. With a waterproof zipper, the case reaches IPX4 or higher. No separate rain cover needed. | Waterproof only with rubber gasket seals — adds weight and cost. | Absorbs water; gear gets wet in rain. |
| Surface Versatility | EVA shell accepts PU leather, ballistic nylon, 600D polyester, carbon-fiber texture, or matte finish — all laminated in the same molding cycle. One-step, no secondary gluing. | Surface finish limited to molded texture or post-paint. Fabric wraps require manual gluing. | Fabric-only; no structural shell option. |
| Temperature Stability | Operating range -20°C to +60°C. EVA doesn't become brittle in cold storage or soft in a hot delivery van. Lens lubricants and sensor calibrations stay stable. | PP becomes brittle below 0°C; ABS softens above 70°C. | No thermal protection for gear. |
| Cost Performance | Die-cut foam + EVA shell production is scalable from 100 to 50,000 pcs without retooling. Per-unit cost drops with volume while protection stays consistent. | Injection molds cost 10,000 and lock you into one shape. | Cheapest per unit, but highest return/repair cost from damaged gear. |
