Cook pasta according to package directions. I usually cook about 5 minutes longer to get more tender.
While pasta is cooking, drain liquid from jar of roasted red peppers. Cut peppers into small pieces and set aside.
Drain pasta and rinse with cold water until pasta is cool and no longer hot. Empty into a large mixing bowl or large plastic food storage container. Add the roasted red peppers and celery seed and mix all together. Add 2/3 of the bottle of ranch dressing and mix well. Store in refridgerator to chill before serving. Dressing will absorb into the pasta and you'll need to mix in the remainder of the bottle of ranch dressing before serving. Sprinkle with some bacon bits on top if desired.