Based on the description of the BANGE backpacks and sling bags, here is a color palette that embodies a modern, sleek, and functional aesthetic suitable for your target audience of students, professionals, and travelers.

 <BANGE Bags Palette>
1. Midnight Black - 
                            
                            #000000
                         - A deep, rich black that conveys sophistication and durability, perfect for an anti-theft design.
2. Steel Gray - 
                            
                            #7D7F7D
                         - A contemporary gray that represents professionalism and versatility, suitable for both casual and formal settings.
3. Electric Blue - 
                            
                            #007BFF
                         - A vibrant blue that symbolizes energy and innovation, ideal for the tech-savvy feature of the USB charging port.
4. Forest Green - 
                            
                            #228B22
                         - A calming green that evokes a sense of nature and reliability, aligning with the waterproof aspect of the bags.
5. Sunset Orange - 
                            
                            #FF4500
                         - A bold orange that adds a pop of color, representing adventure and excitement for travelers.

This color palette blends modernity with functionality, appealing to the lifestyle of your target audience while ensuring the bags stand out in the market.

Would you like to explore specific design elements for your marketing materials or maybe need guidance on how to implement this palette in your branding?