What happens next?

How to wash a backpack
Empty your backpack.
You don't want to wash any items in your backpack that could be damaged by water. Turn your backpack inside out and use a small vacuum to clean the hard to reach interior corners of your backpack that might have small particles of dirt and garbage.

Available choices:
[a]. Listen to how to go about this as well. If you know to vacuum, you can get rid of any large particles which could keep your backpack dirty.;
[b]. To clean the inside of your backpack : Have a friend help you with this portion of the process. You'll probably have no problem cleaning a backpack with less mess then having to get a whole bag out and running around and doing laundry.;
[c]. Once you are finished emptying your backpack, leave the pockets unzipped. Set all of your belongings from inside the backpack in a plastic bag, so you can put it all back in after you clean your bag.;
[d]. Keep the bag on while you clean it. Blow on the bag to clean it.;
[c].