First do a search on mulching as its been discussed here many times.
I have not bagged a lawn since 96. As long as the lawn looks neat without obvious clumps the customer wont care where the clippings went. If it becomes an issue most municipalities and/or manufacturers have literature for the asking on the benefits of mulching vs bagging, most of it pretty convincing I might add.
This past season was the first season where I mulched more leaves in the fall than hauled. Two trips to the leaf dump total vs. twenty or thirty in past years.
Whether its mulching or double blading once you discover how much time and money you save not having to handle debris you will kick yourself for having bagged at all.