When It comes to Luggage, I'm a believer in "Size Matters". Since now with TSA your luggage has to be no my than 114 cm (45in), you need to make sure that if you tend to over pack...Like myself...make sure it doesn't exceed TSA approval because you will have to pay. For more information on Packing tips for TSA, check out TSA.gov.
Last year I discover the fabulousness that is hard shell luggages that are lightweight. They are really good, not that heavy and good to roll around. The luggage I use to have was a Delsey 24' Luggage...I love that luggage but the only thing that I didn't like about it was the weight of the luggage, I had my share of having to take out clothes out of my luggage so I didn't have to pay the fee and it's just an annoying feeling to have to take out my clothes in the middle of the airport to put them in my carry on or my mom's luggage.
My new luggage that I have now is a Nine West Watercolor Flower 24' Suitcase that my mom brought me from Burlington Coat Factory last year for my fourth cruise vacation. It was really good to have, so I came with six different luggages, some are hard shell lightweight luggages and some are regular luggages but they are also lightweight too and also good to use when you go on vacation.
One Tip: Make sure you know what you want to pack. Don't pack everything under the sun because you are not going to wear everything. Just make sure you know what you want to bring so that you don't bring a lot of stuff.
What kind of luggages do you have? Are they lightweight? What advice do you have when it comes to packing?