Selecting a supplier for fish-shaped soy sauce bottles (commonly used for sushi takeout) requires balancing food safety compliance, leak-proof design, and material quality. Buyers should prioritize BPA-free LDPE (Low-Density Polyethylene) materials, as they are flexible enough for squeezing while remaining food-safe. Ensure the screw-cap or snap-on seal is airtight to prevent leakage during transit in food delivery apps. For high-volume buyers, look for automated production lines that can guarantee a consistent fill volume (typically 3ml to 8ml) and clean edges without plastic burrs.