You can only carry liquids, aerosols and gels in containers of 100ml or less when you pass through security. They should all fit into one transparent, re-sealable 20cm x 20cm bag.
Can I have a carryon and a backpack and a purse?
Most airlines allow passengers to bring on both a carry-on and a personal item like a backpack, laptop bag, purse, briefcase, shopping bag, etc. The general rule of thumb is that your personal item is smaller in dimension than your carry-on bag and it can fit underneath the seat in front of you.