These rules apply to items in any and all carry-on bags (carry-on-sized suitcases, backpacks, purses, laptop bags and more) that you plan to take through security. The TSA's 3-1-1 rule outlines ...

And given that you'll be schlepping it on your back or shoulders for hours at a time, a good personal item needs to be just as ergonomically designed as the best carry-on bags or the best luggage.