Convenient struction — 45 degree opening zipper position main package, can prevent the inner bag items falling, use more at ease. Reduce burden — Stylish model,comfortable sponge strap and back of the backpack have a holding strap which can hold the backpack on pull rod of travel rod box which may reduce your burden during travel. Waterproof — Made of water resistant synthetic leather and ballistic nylon material, protects your belongings in backpack in the rain.（drizzle, not heavy rain) Main Material:Waterproof synthetic leather + microfiber. Handle:synthetic leather. Linnig material:polyester. Size: 30×12×39cm (L×W×H) / 11.8”L × 4.7”W × 15.4”H (fits up to 15" Laptop.) The spacious main compartment is suitable for books, A4 documents, clothes and umbrellas etc. As father's day gifts.