3 way switch with multiple outlets
To explain a bit:

Both travelers (Red and Black) must be continuous from the first to the second switch. Then from the second switch you would connect the non-traveler (now the switched wire) to each outlet.

If the outlets are along the path of the travelers then that means that each outlet will have 4 wires (+ground): the neutral, the switched wire and the 2 travelers.

Convention for the color codes in the switches are 


red and marked white = traveler. 
black = switched wire
white = neutral.


current code also requires you to pull the neutral to the second switch (left capped off if not used) as future proofing for when you want to connect a timer or motion sensor.