How do you handle the challenges of class to class? Carry a bag? Any suggestions on a good bag to purchase? I found 2 bags from Ameribag: large baglett and the catskill esopus--What do you think? The baglett is nice because it sits on one's back. http://www.amazon.com/AmeriBag-8610...r_1_1?s=apparel&ie=UTF8&qid=1310756140&sr=1-1 http://www.amazon.com/AmeriBag-Esopus-Shoulder-Bag/dp/B001CEBN4A Do you keep anything in each classroom? Please help!