I am seeing a lot of sarcastic comments here without any attempt to find out the facts about a crewmember's life.
All crew members are required to have 15 year background check with the FBI and a 15 year background check with the DOT. The DOT background check is more stringent than the FBI background check.
All crew members are randomly drug tested.
The airline which hires crewmembers knows their school, work and travel history.
All crew members can have their bags checked at random at any time.

Zero passengers are required to have a background check with with the DOT or FBI as a condition of carriage.
Zero passengers are randomly drug tested as a condition of carriage.
Zero passengers are required to provide their school, travel or employment history or even their arrest history to the airline.
Airline crew members pretty much gave up all of their privacy to the system a long time ago.
Crew members are not on vacation. They are often housed in hotels with poor food choices and only expensive transportation choices for creature comforts. Crewmembers often have minimal rest between work days.
So they need to bring extra things along because they are trapped at the airport and flea bag hotels in the middle of nowhere most of the time.
Also you can check liquids. Crew members are not given a way of checking bags. So we travel around the world solely with what is in those bags you see us dragging behind us. Plus the airlines keep finding ways to make us work more and more. I am on the road 21-23 days a month. Is it so offensive to you that I am allowed a few of the creature comforts you take for granted at home on a day to day basis?
I know travel makes most people cranky but truthfully a pilot or flight attendant with a bottle of water makes zero difference in the type or quality of travel experience you have.
Pilots and flight attendants are not super priviledged. These are just people trying to get by in the world just like you. Our jobs are just differently structured than yours.