[ Compacity & Multi-compartment Design]Measured 13 x 16.92 inch. The main compartment is big enough for a size 7 basketball, let alone other personal items such as laptop, clothes, etc. The bottom compartment is for your sneakers. And the separated bag in the main compartment is for wet items. The 2 mesh pockets on the both sides of the bag are for umbrella or water cettle. The zipper pocket on the side is for small things like keys, wallet or cell phone.[Durable Waterproof Drawstring Bag]drawstring backpack is made from high quality 1080D oxford fabric . but durable enough to resist water, dirt, dust. Keeping the stuffs in the bag dry and clean.[Adjustable Wide Drawstring Shoulder Strap]With the adjustable shoulder straps, you could choose a comfortable length. And the more ergonomic straps could protect your shoulder from harm by reducing the pressure on the shoulders while carrying heavy items or having a long time journey.Color: BlueMaterial: Oxford clothPackage Contents:1X Drawstring BackpackOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.