Porcelain sculptures are delicate and require meticulous packaging to prevent damage during transit. The most effective materials combine cushioning, stability, and shock absorption. Here are the top choices:

1. Custom Foam Inserts: Pre-cut foam molds snugly fit sculptures, immobilizing them and absorbing vibrations. Ideal for high-value pieces.

2. Double-Walled Corrugated Boxes: These provide structural rigidity. Pair with inner packaging for optimal protection.

3. Air Cushioning Film: Lightweight and reusable, this material fills voids and cushions impacts better than traditional bubble wrap.

4. Biodegradable Packing Peanuts: Eco-friendly and excellent for filling empty spaces, preventing movement inside the box.

5. Edge Protectors: Foam or cardboard corners shield fragile edges and intricate details from direct hits.

For extra security, use a combination of these materials and always label packages as "Fragile." Testing the packaging by gently shaking the sealed box can help identify potential weaknesses before shipping.