Waterproof material: The storage bag is made of oxford and nylon fabric, waterproof, wear-resistant, and the waterproof lining is moisture-proof and waterproof, waterproof and durable, double protection. Ideal artist portfolio: Size: 50 x 37 cm, a main compartment with surround zip is easy to place sketchbook or drawing board. 2 front zippered pockets for paints, sketch pens or brushes. Optional handbag or art backpack: You can tighten the straps for hand carry or you can carry it on your back for going out and sketch, free your hands and do something else. It is slim, can also be stowed in the luggage. Sturdy and durable: Whether it is the shoulder strap, handle, zipper and other joints with tight seams, fine workmanship is not easy to misplace. Suitable for MANY OCCASIONS: It can be A3 drawing bag, sketchbook bag, art folio folder, artist portfolio or art supplies storage bag or art backpack, suitable for artist, student, beginner or hobbyist, or as a gift for your friends who love sketching or drawing.