Space-saving foldable design: The bag folds flat when not in use for easy storage. Its compact, foldable form makes it a practical “just in case” bag for travel, freeing up space in your closet or luggage after your trip. Removable wheels for versatile use: Wheels can be added or removed in less than 30 seconds, transforming the bag from a duffel into a rolling suitcase. This helps you avoid trolley fees and carry your bag more comfortably through airports and stations. Large 40-liter capacity: With 40 liters of capacity, this bag provides ample room for weekend getaways or longer trips. Pack essentials and potential extras without crowding. Expandable bottom for additional storage: Unzip the bottom to expand capacity by 25%, giving extra space for souvenirs, spare clothing, or unexpected finds on the road. Use scenarios: - Weekend city break: fits daily wear, shoes, and toiletries; fold flat when not needed and expand for shopping on the return. - Business trip: convenient as a compact rolling bag at the airport; use extra space for documents or gifts. - Family road trip: add gear and outfits for the kids; bottom expansion accommodates souvenirs or additional clothing.