Sea to Summit Ultra-Sil Duffle Bag
Don’t waste precious space and weight on a structured bag with wheels. Sea to Summit’s Ultra-Sil fabrics make for tough, durable, water resistant, and lightweight bags. Their duffle (get it for $25 at Amazon) is ideally sized at 10.5 gallons — I travelled for six months with a bag this size — and weighs just 2.8 ounces empty. The Ultra-Sil fabric is reinforced at stress points and designed for carrying a heavy load. There are double YKK zippers so you can lock the bag closed. And it compresses into a tiny packet smaller than your hand for storage.