When it comes to working, whether you're a full-time employee or a part-time intern, presentation and performance are vital. Yet, coming to work prepared and bringing exactly what you need is just as important. Forgetting something that you need can be one of the worst feelings ever. However, you should never overpack or schlep around a million things in an insufficient way—this will only slow you down and tire you out.

Here are 20 purse (or backpack) essentials for the female worker or intern: