Guide
Send a Reaper Project to Avid Media Composer
Media Composer can import OMF files, so a Reaper project converted to OMF can go back to the picture editor.
OMF actually originated at Avid, so Media Composer still imports it: open a bin and use Input > Import Media to bring in the .omf file.
The converter embeds the audio in the OMF, so there are no separate audio files to link — check with whoever is picking up the session if they'd rather have something else.
You can convert your Reaper project to OMF for free here.
Going the other way? Here's how to open an OMF file in Reaper.