Conceptual sketch

My scrabbles from brainstorming session

Based on my analysis, below seem to be what I am looking for the general design functions;

1. Conventional shape and color with a bit of edge that can be suitable for almost every occasions.

2. Lightweight

3. Water resistant

4. Strong protection inside

5. Additional interchangeable functions:

-Fit all 3 sizes of MacBook Pro * either expandable or

13 inch (H: 2.41㎝ W: 32.5㎝ D: 22.7㎝ W:2.04kg)

15 inch (H: 2.41㎝ W: 36.4㎝ D: 24.9㎝ W: 2.54kg)

17 inch (H: 2.50㎝ W: 39.3㎝ D: 26.7㎝ W: 2.99kg)

-Organization spaces for computer necessities and valuables

-Length adjustable handles