Features:

1. Spacious Interior: Ensure the bag has ample space to store a wide variety of toys, from small action figures to larger items like stuffed animals and building blocks.

2. Multiple Themes: Offer a range of themes to cater to different tastes and age groups. Themes could include animals, space, and more options.

3. Durable Material: Use sturdy, tear-resistant materials to withstand the wear and tear of daily use.

4. Wheels for Mobility: Include wheels for easy maneuverability. This makes it convenient for children to move the bag around without struggling to carry it.

5. Handles for Lifting: Along with wheels, provide sturdy handles on the side and sides for lifting the bag when necessary.

6. Easy to Clean: Use easy-to-clean materials, such as wipeable fabric, to make it simple for parents to maintain the bag's cleanliness.

7. Safety Features: Make sure all components, including wheels, meet safety standards for children's products.

8. Main Compartments: Main Compartments inside the bag to help organize toys by type, size, or theme.

9. Lightweight Design: Keep the bag lightweight when empty, making it easy for children to handle.