With the Fourth of July just around the corner, public safety agencies are preparing for big crowds and plenty of revelry.

Massachusetts State Police spokesman David Procopio said “a multi-layered, multi-agency security plan’’ will be in effect and State Police, local police, trained dogs, and federal bomb-detection teams will be working to keep everyone safe during the festivities.

“Some security assets and personnel will be visible to members of the public, while many others will not be visible,’’ Procopio said in an e-mail.

The State Police Marine Unit will be patrolling the Charles River, the Air Wing will provide continuous support, and plainclothes troopers and police officers who are trained in behavioral observation will be dispersed in the crowd to detect any potential threats, Procopio said.

One new security tool for the Fourth of July celebration will be a tethered drone that will provide police with an aerial view. Procopio said police used the drone at the Boston Marathon and Sail Boston and it proved to be “very effective.’’

If you’re going to venture down to the Esplanade for the July Fourth concert and fireworks (or for the July 3 rehearsal) use a clear bag to carry your personal items, and remember that anything you bring in will be subject to inspection. Backpacks, shopping bags, and coolers on wheels are prohibited. Firearms are a no-no, as are sharp objects, fireworks, propane tanks, and open flames.

And leave your drones at home — they aren’t allowed.

Cans, glass containers, alcoholic drinks, and premixed beverages of any type are also prohibited. If you want to bring something to sip, make sure it’s in a sealed clear plastic container, no larger than a 2-liter bottle.

And for all of you cyclists out there, take note: No bicycles will be allowed through the checkpoints into the oval and island/lagoon areas of the Esplanade. Bicycles are allowed throughout the rest of the venue, but don’t leave them unattended. Any bikes that are locked to fences, poles, or other structures will be subject to removal.

A Boston Police Department spokesman, Lieutenant Detective Michael McCarthy, said police will have an operational plan in effect similar to those in years past, and a public safety press conference is scheduled for Friday.

“As of today there are no known threats to July 4th,’’ McCarthy said in an e-mail.

Emily Sweeney can be reached at esweeney@globe.com. Follow her on Twitter @emilysweeney.