you’ve got the option to protect your backpack and washing machine with a pillowcase.
Not to mention the straps themselves can get tangled around the spinning agitator if your washing machine has one.
An old pillowcase you dont care about very much is best.
Then tie the pillowcase shut and drop it in.
Add a little detergent and wash it in warm water on the gentle cycle.
This keeps your backpack and washing machine safe.
Plus, if you didnt get everything out of your backpack (like change, pens, etc.
), the pillowcase will keep those from going where they shouldnt.
When its done washing, hang it somewhere to air dry.