MATERIAL- 35L,17.7"*11.4"*5.9", weights 2.45lbs. It's made of 600D Water-resistant Polyester. Fits 15.6" Laptop. QUICKLY ACCESS- The backpack has large zipped access at front that can quickly access to the main compartment, opend as a 15.6" luggage. 3 WEAR STYLES- You can use it as a backpack, shoulder bag and messenger bag. The straps are detachable with a buckle and can be hidden to the back pocket if you need a shoulder bag or a messenger bag. TROLLEY CASE FASTEN SYSTEM- With the luggage strap, this travel backpack can be stowed on the trolley case and pushed easily to release the weight of shoulder during travel. DURABLE & MULTIFUNCTIONAL- This daypack can be used as a survival backpack,army backpack,trekking backpack or day pack. Suits for Hiking,Camping,Trekking,Traveling,School or daily use.