Protein Shaker Lid CAD Design

I'm seeking a detailed CAD design for a round, leak-proof lid for a protein shaker. The lid should be designed to accommodate a compound of silicone and BPA-free plastic.

Requirements:
- Round shape
- Leak-proof sealing
- Compatible with silicone and BPA-free plastic materials

Ideal Skills & Experience:
- Proficiency in CAD software
- Experience with product design, especially for consumer goods
- Knowledge of silicone and BPA-free plastic properties

Looking forward to your bids!