Thermos & Cup Suitcase Design

I'm looking for a custom suitcase designed to hold a thermos and two cups. The suitcase should be durable and functional, with a preference for polycarbonate, although I'm open to other materials.

Key requirements:
- Size: Small (fits one thermos and two cups)
- Material: Preferably polycarbonate, but open to alternatives
- Detailed project proposal

Ideal skills and experience:
- Experience in designing and constructing durable cases or luggage
- Knowledge of different materials and their properties
- Ability to create detailed and functional design proposals

Please include a detailed project proposal in your application.