MULTI-PURPOSE USE: This Travel Duffle Bag can be used as a gym bag, a carry-on bag, a travel bag or a day bag.- DIMENSION: Unfold with 18x14x7inch/45x35x17cm and fold with 8x7inch/20x18cm. Not too large, but very fit for daily life.- MATERIAL: Made of high quality water resistant and tear resistant Nylon material. It's lightweight, easy to pack and durable.- EASY TRANSPORT: A strap allows bag to slide over the luggage upright handle tube for easy transport. Fast folded and easy to carry.- PORTABLE LIGHTWEIGHT: Once finished using, you simply fold it away neatly back into small size. The bag also serves as a little side pocket when the bag is in use. It's lightweight enough to take along.