Any decent CSA that isn't having a terrible crop-failure year is going to overload you with produce. Even if they didn't there's a good chance that you'll get a boatload of one product all at once (e.g. "there's a heat wave next week so I harvested everything this week before it bolts, hope you like brassicas"). The key to getting the most out of your CSA is canning, freezing, dehydrating, and/or fermenting the bounty while you have it and slowly enjoying it all year long! Most CSAs only last a few months anyway, so it's a feature not a bug that they provide you with more food than you could possibly consume fresh.