Two week Europe trip: one carryon.

Hello! I live in the U.S. and I’m currently planning my first trip to Europe this summer. I’ll be going for two weeks and I really can only bring a carry on suitcase. I want to buy a new one for this trip so I need some help finding the best one, here’s my wishlist:

- hard shell

- locks (i’ll be staying in hostels, I want to keep my things as secure as possible)

- largest capacity I can get while still fitting into European carryon limits

- would love a charging port if possible put no necessary

- under $200

thank you in advance for any suggestions!