"Where can I buy anti-theft waterproof USB backpacks ?

you are in right place!!!  

So, you can effortlessly charge and use your phone while walking with your backpack.

• It protects you from theft.
• You can conveniently charge your phone.
• It keeps your items organized.
• They are designed to be comfortable.
• USB charging port
• waterproof
• unisex -prefect for male and female
• School, Excursion, Going out, Sport, Travel, etc.