[Foldable Design] : Greatly save space after folding, easily carry on your flight and travel after expansion. Great idea as an extra bag into your luggage bag. Folding Dimension: 28 x 18 x 4cm. Unfolding Dimension: 42 x 28 x 22cm. Expansion Dimension: 42 x 38 x 22cm. [Durable Material] : Made of high-density nylon, waterproof, light weight, but durability will never be deducted; high-quality hardware, neat stitching, and stylish design all make this bag a perfect travel bag . [Bottom Extension & Multi-Pocket] : The bottom of the zipper hides the expansion function, allowing you to solve the trouble caused by too many or too few items during travel. Two zipper pockets and two Inside patch pocket and a wet and dry separation bag on the bag. It is enough for short trips and can easily accommodate 3-5 days of travel clothes. [Portable & Convenient] : The bag is perfect for day-to-day use or occasional travel, the fixed strap design on the back enables it to be placed on the luggage easily, perfectly suitable size as personal item for airplane seat in front of you, quite convenient for travel. [Intended Use] : Gym, Sports, Travel, Weekend, Luggage, Carry-on Bag, Shopping Bag, Beach Bag, Hiking and Camping. Suitable for women, men, teens and big kids, great idea as personal item for airline travel and emergency spare bag in the suitcase.