A single suitcase being packed. Credit: Alex Huang/Travel + Leisure Travel experts say one-bag travel starts with choosing versatile shoes and building outfits around a neutral, mix-and-match color palette.Lightweight, odor-resistant fabrics like merino wool and multipurpose items can help reduce bulk and extend wear between washes.Packing cubes, refillable toiletry bottles, and smart tech accessories make it possible to travel for days—or even weeks—with just a carry-on. We've all been there: standing in front of a big open suitcase the night before a trip, wondering if we really need 10 pairs of underwear, six pairs of jeans, and four pairs of shoes for a four-day getaway. The answer, according to travel experts, is a definitive no. In fact, you might consider ditching the checked bag completely. One-bag travel, aka traveling with just one carry-on, has evolved from a backpacker's necessity to a mainstream travel philosophy.…