Watch Your Weight
Following your partner as he waltzes up the metro stairs with a light knapsack while you lug a 75-pound suitcase will put a strain on your back and your relationship. Determine what size bag you'll both need and make sure they're close in size and weight. Don't buy luggage blindly online, says Seper; test it out first. If you need something with wheels, take a rolling suitcase for a few spins around the store to see how it handles corners and whether you can lift it easily. Many stores have weights that they can put in a knapsack so you can see what that feels like on. Also, investing in a portable scale helps eliminate overweight baggage surprises at the airport.