No matter the age of your kids, they are bound to have a lot of gear. Whether that means diaper bags, school books or sports equipment, it all needs to be stowed securely in the cargo space. Items weighing more than 10 pounds or those that are oddly shaped can injure occupants in a collision if they are stored on a seat or the floor. Make sure all the gear you typically carry fits in the cargo space or trunk of your new car -- before you buy it. Look for built-in cargo nets, pop-up bins and grocery bag hooks or add the aftermarket versions to increase the flexibility of your space. Many vehicles also have built-in under-floor storage that is useful for stowing infrequently used items or things that need to remain out of sight.