Whether flying by plane or driving by car, the weight of your luggage can have an impact on overall fuel efficiency. The heavier your bags, the more fuel planes and cars have to use to transport you. So pack light and leave things like hair dryers and extra pairs of shoes behind at home. And toss in a reusable water bottle and lightweight reusable bag; the water bottle can be filled with filtered water at the hotel gyms or at airport water fountains, and the reusable bag can be used when you pick up souvenirs or basic supplies from local stores.

Everyone loses socks. So what do you do with the stray single sock you have left? Don't toss it -- you can reuse it around the house! Fill a sock with cedar shavings, tying it off at the top; since socks are porous, the cedar scent will permeate the air inside a closet and keep moths at bay. To keep your car windows from fogging up, fill a sock with kitty litter, and tie a knot at the end. Place it by the window, and it'll absorb excess moisture, keeping your car windshield crystal-clear.

When storing leftovers in the refrigerator, it's imperative to cover the food to keep it fresh. But did you know covering your food also helps save energy? A refrigerator has something called a compressor; its job is to keep the air inside the fridge cool. Moist air in the refrigerator is harder to keep cool, so the compressor has to work harder. Uncovered food emits moisture, and over time, it uses more energy. Investing in reusable silicone covers or foil to cover food is a simple and easy way to help save energy and money.