Please attention that:there are two different sizes about this bag,15.6inch and 17.3 inch,please choose the size you want before you place the order.What's more,the strap is on the bag,if you want to change the different use mode,please follow the Arrows Indicate as the following pictures to change the Specific mode you need.

Description:
Color:Grey,Black
Material: Nylon
Weight: About 1350g

Detail in size:
15.6inch:length:31.5cm(12.4inch) X depth/width:17.5cm(6.9inch) X height:40.5cm(15.9inch)
17.3inch:length:34cm(13.4inch) X depth/width:18.5cm(7.3inch) X height:46.5cm(18.3inch)