The Protégé Navigation Travel Duffel is built around one standout idea: it zips from end to end to fold completely flat. That makes it an easy extra bag to tuck into your suitcase on the way out and bring back full when you've picked up items along the way. With capacity guidance geared toward 5 to 7 days of travel and a lightweight build, it's a practical choice for trips, return-trip overflow, sports, and other occasions when you need a second bag you can pack away. An adjustable, detachable shoulder strap lets you carry it hands-free or over your shoulder, and a rear add-a-bag strap slides over most telescopic luggage handles so it rides along with your rolling bag. Inside, a sewn-in foldable bottom board helps the duffel hold its shape when it's loaded, while interior pockets and a pouch keep smaller items organized.