LmeisonBackpack for Teen Boys, Anime Backpack Casual Daypack for Travel

Hiw do you charge the bag up

Will washing the back pack ruin the USB port in washing machine?

Do I have to purchase a separate charging bank to hook to the backpack to use to charge my phone?

What is the s for? i've seen some with k or with no letter. doesn't seem to match the company name, just curious.