Start by listing what you carry every day, such as a phone, wallet, keys, books, lunch box, or water bottle. The bag should fit these essentials without becoming unnecessarily bulky.
Look at the strap, handles, compartments, and closure. A comfortable strap matters for regular carrying, while separate pockets can keep smaller items easy to find.
Choose a material and colour that work with your routine. For frequent use, practical surfaces and simple designs are often easier to maintain than delicate decorative details.