Custom Waterproof Polyester Backpack

I'm seeking an experienced manufacturer to create a durable, waterproof backpack. The backpack should be made of ripstop polyester with a waterproof zipper, and it should be able to hold 20kg or more.

Key Requirements:
- Type: Backpack
- Material: Ripstop polyester
- Weight Capacity: 20kg+
- Zipper: Waterproof
- Additional Features:
- Multiple compartments
- Padded straps
- First Aid Kit compartment

Ideal Skills and Experience:
- Experience in manufacturing durable backpacks
- Knowledge of ripstop polyester and waterproof zippers
- Ability to integrate multiple compartments and specialized sections (like a First Aid Kit compartment)
- Experience with ergonomic design for padded straps

Please provide samples of previous work and estimated timelines.