Travis Barker and Kourtney Kardashian are traveling with all the small things as they hit the road for the Blink-182 tour … because baby Rocky is riding the tour bus too!!!

Rocky was all snuggled up in a brown onesie Friday as Kourtney carried him in her arms … and they boarded the tour bus with Travis.

The family of 3 was in New York City this morning before hitting the road and heading south to Ocean City, Maryland … where Blink-182 is about to play a concert.

Kourtney gave birth to Rocky back in November in Los Angeles, so the kid is already getting accustomed to the rockstar lifestyle … he’s not even a year old and he’s already a roadie.

Rocky’s been spotted in some of Kourtney’s social media snaps from the tour — riding a miniature flying saucer around backstage — but this is the first time we’ve seen them all together as a family between shows.