Students at Marjory Stoneman Douglas High School returned from spring break on Monday (local time) and were greeted by security barriers and bag check lines.
Last month, families of the Florida high school where a gunman killed 17 people where informed by Broward Schools superintendent Robert Runcie that clear backpacks would be a requirement following spring break.
The clear backpack initiative was one of many measures put into place after 17 students and staff members were gunned down at the Florida high school in February, but students are expressing their disappointment in the school district.
Sarah Chadwick, one of the students who led the #NeverAgain movement, tweeted: "Tomorrow we will have to go through security checkpoints and be given clear backpacks, my school is starting to feel like a prison", she wrote.
Some see it as an invasion of privacy, and some say it's not the change that's needed to ensure school safety.
Delaney Tarr, a student activist at the school, spent much of her Monday evening - and some of her early Tuesday morning - decorating her school-issued bag with pins and paint, and also tampons.
Florida Highway Patrol troopers are guarding entrances to the school as Governor Rick Scott promised almost two weeks ago.
Lauren Hogg took to Twitter Monday with a photo of her wearing her new school-issued backpack saying she appreciates "the effort" but there should be more of a focus on stricter gun laws. Many carried lunch in clear plastic bags.
"They did not check my I.D.", Annabel said. "I feel so safe now". "As a first step, we are looking to see if we can get the kids through these entrances in a timely manner", Principal Ty Thompson said in a memo to parents.
Officials also plan to implement metal detectors.
Thanks to the outspokenness and energy of surviving students like David Hogg and Emma Gonzalez, the tragic shooting has sparked a movement against gun violence and for common-sense gun control laws.
Safety expert and former police officer Michael Dorn said clear backpacks were not an effective method in preventing school shootings.
'When people pay money for these modifications on our school (the only school in the country that is being altered btw) that means someone is getting paid and I am sick and exhausted of us being treated like prize pigs'. Sports bags and instrument cases are now checked at entry points and must be dropped off with a teacher or coach before school starts.