In light of the bombings at the Boston Marathon, San Francisco officials are taking extra precautions when it comes to this year’s Bay to Breakers race.

Among the extra measures – no backpacks, large bags or any type of container/carrier larger than 8 ½” x 11” x 4” will be allowed on the race course. Floats, shopping carts, large rolling objects, coolers, ice chests, alcohol and unregistered runners are also not allowed on the race course, all of which has been part of the race’s guidelines for the last several years.

The event, often known for its frivolity, wild costumes and party-like atmosphere, may have a different feel following the deadly bombings in Boston.

San Francisco Police Chief Greg Suhr said the Boston Marathon bombings have raised awareness for potential attacks. He’s asking observers and racers to notify authorities or race officials if they notice anything suspicious on the day of the race.

The Bay to Breakers, which has Craigslist as its presenting sponsor this year, donated part of its registration fees to the One Fund Boston late last month. The race is set to take place on Sunday, May 19.