What it says on the tin. I need something I can throw in the laptop bag that will let me plug more than one thing into an outlet. I'd say the primary purpose is so I can share one outlet with several other laptop users in class or a cafe with insufficient power supply. Cool tools has recommended me the following two: Monster To-Go 4 outlet travel power strip. Yellow Jacket 5-outlet adapter. I don't think I'm seriously considering the yellow jacket, since it's bulky and lacks its own extension cord. But does anyone have any better recommendations than the Monster travel strip?