Durable and waterproof material: A3 art portfolio case crafted from Oxford canvas for sturdiness and long life. Inner lining is water resistant, protecting your art supplies from moisture and degradation. Large capacity: Size 530 x 400 mm (20.9 x 15.8 inches). Fits large drawing boards, pads, photos, prints and artworks without folding. Also capable of holding easels, sketching papers, pencils, brushes, folding buckets, paints, books and other compatible items. Ergonomic design: Adjustable shoulder strap for convenient carrying. The hand grip is rubbercoated to reduce fatigue. Metal zipper provides durable, smooth operation and easy access. Versatile carry options: Functions as a shoulder bag, backpack, or handbag. Simple, lightweight design (about 390 g) for easy transport and easy cleaning. Use scenarios: Transport large artworks between classrooms, studios, or galleries. Plein air sketching, travel, or field work with essential supplies. Daily studio organization and easy transport of boards, papers, and tools.