I actually have a 5 gallon bucket of starsan for larger items... Like this.
Soak the bag, drain it and fill with hops.
OR, you can dry hop in the fermenter. Wait until activity has slowed down (little airlock activity, or 4 points above expected final gravity). Pour hops directly into fermenter and swirl the carboy/bucket to get everything nice and stirred up. Repeat the swirling once or twice a day for the next 3 days, then let settle until day 14 of fermentation. rack off and you are done.