1. MATERIAL - 16 high density 16 ounce Cotton Canvas. It fits as a carry-on bag for most airlines, great for 3-4 days overnight bag2. EXPANSION DESIGN - Size: 53cm (L) x 30cm (H) x 25cm (W) / 20.8' (L) x 11.8' (H) x 9.8' (W). Unique expansion design, both side pockets can be extended by zippers as your need. Idea for 3 to 5 day short trips. Compartments: 2 side pockets, 2 front zipper pockets, 1 back zipper pocket, 1 inner zipper pocket.3. MULTI-FUNCTIONAL - The bag can be used as a flight bag, travel tote bag. Large capacity, can fit 14' Laptop, iPad, several clothes and shoes together. Great Choice for large overnight bag, short journey bag, weekend travel bag, sports duffel bags, gym tote bag4. SPECIAL RUBBER MAT - Wear-resisting diamond-shaped rubber mat at the bottom protect the bag from damage. Adjustable and remove-able shoulder strap. Padded shoulder strap tab make more comfortable when carrying the bag on your shoulder.