The main thing to avoid is bending the thin cable right where it attaches to the box.
2 replies
way too tight there, bad idea
Careful with your charger and its cable
Do not make any hard bends or folds in your charging cable, or wind it tightly, always make either circles or loose loops when winding your cord up for storage. Also do not, as many people have seen, unroll your charger block from the magsafe end by letting the charger drop and unroll itself like a yo-yo, this is both hard on the charger and its connection points at both ends.
http://support.apple.com/kb/HT1630
Considerations for the long life of your MacBook. Handling and environmental care tips
What is the proper way of wrapping the cable of power adaptor?