## Common ground
All options refer to containers designed for storing breastmilk, typically used for freezing or refrigeration.
## Options at a glance
**3924.10 – Made of plastic material**
- **Defining trait:** Constructed primarily from flexible plastic (e.g., polyethylene), commonly used for single-use storage.
- **Typical examples:** Zip-lock style breastmilk bags, freezer-safe pouches with measured markings.
- **Best fit when:** The product is lightweight, transparent or translucent, and designed for disposable use.
**4014.90 – Made of rubber**
- **Defining trait:** Constructed from natural or synthetic rubber, typically flexible but less common in modern breastmilk storage.
- **Typical examples:** Rare; older or specialized reusable containers with rubber seals (not standard for milk storage).
- **Best fit when:** The product has a rubber-like, elastic seal or is part of a reusable, non-plastic system (e.g., silicone-rubber hybrid).
## Key differences
| Feature | 3924.10 – Plastic | 4014.90 – Rubber |
|---------------------|----------------------------|----------------------------|
| Material | Polyethylene, PVC, etc. | Natural/synthetic rubber |
| Common use | Disposable storage bags | Rare; mostly seals or parts |
| Durability | Single-use, low durability | Reusable, higher elasticity |
| Modern prevalence | Very common | Extremely rare for this use |
## How to choose
- Is the bag made of flexible, lightweight plastic (e.g., clear, thin film)? → 3924.10
- Does it contain rubber or feel like a rubber seal (e.g., stretchy, bouncy)? → 4014.90
## Overlaps & pitfalls
Some products may use rubber-like materials (e.g., silicone) but are not true rubber—these should be classified under plastic (3924.10). The term "rubber" in HS Code 4014.90 refers specifically to vulcanized or natural rubber, which is uncommon in breastmilk bags. If unsure, prioritize the **main material**: if it's plastic, use 3924.10; if it's clearly rubber (e.g., a rubber seal on a bottle), then 4014.90—but such products are rare