Colored Pens ($8.95) - Grab! I love using colored pens in my planner. I haven't used the ones from Erin Condren, but colored pens in general are a must for my planner
Elastic Bands ($6.95) - Maybe, If you're the type of person to just throw stuff in you planner, then the elastics may be a good option for you. I typically like to keep my papers filed or on paper clips so I use them less and less. But I do use a band on the front half of my planner making it super easy to flip to the month spread. Like I said earlier, the little red tag shown in the picture can double as a pen holder which is really nice!
Photos via. "Erin Condren Website"