I believe that a good gym bag is as essential as an everyday go-to day bag.
Spacious is a must. It has to be big enough to carry the must-haves, like at least a water bottle, your shoes, clothes, and an iPod (in a separate compartment of course). And I don’t know about you, but the color is really important as well. I tent to drift towards the grey palette (above are my picks). I usually wear some color when I’m working out – it brights up my mood, I guess. So a monochromatic usually works best for me, just matches everything. Although, ask me next week and I could be all about the bright.