## Common ground
All options are baby bottles made from different materials.
## Options at a glance
**3924.10 – Plastic**
- **Defining trait:** Made from synthetic polymer (plastic), typically lightweight and shatter-resistant.
- **Typical examples:** Polypropylene (PP) or polyethylene (PE) bottles.
- **Best fit when:** You need a durable, portable, and affordable bottle for everyday use.
**4014.90 – Rubber**
- **Defining trait:** Made from natural or synthetic rubber, flexible and often used in older-style bottles.
- **Typical examples:** Traditional rubber teats (nipples) or vintage rubber bottles.
- **Best fit when:** You're using a vintage design or prefer soft, flexible feeding parts.
**7013.42,7013.49 – Glass**
- **Defining trait:** Made from borosilicate or soda-lime glass, non-porous and heat-resistant.
- **Typical examples:** Clear glass bottles with silicone nipples.
- **Best fit when:** You prioritize safety (no BPA), easy cleaning, and thermal stability.
## Key differences
| Feature | Plastic | Rubber | Glass |
|------------------|---------------|---------------|----------------|
| Material type | Synthetic polymer | Natural/synthetic rubber | Inorganic glass |
| Durability | High (impact-resistant) | Moderate (can degrade) | Low (breaks easily) |
| Heat resistance | Medium (some melt) | Low | High |
| Safety (chemicals) | May contain BPA (if not labeled BPA-free) | Generally inert | No leaching |
## How to choose
- Is the bottle made of a hard, lightweight synthetic material? → 3924.10
- Does it feel soft and flexible, like rubber? → 4014.90
- Is it clear, rigid, and made of glass? → 7013.42,7013.49
## Overlaps & pitfalls
Rubber is rarely used for entire bottles today—most are rubber nipples on plastic or glass bases. A bottle with a rubber nipple but plastic/glass body should be classified by the main body material. If unsure, prioritize the **primary structural material** (e.g., glass or plastic)