Many may disagree but I don't risk cross-pollination although many believe that tomatoes are low risk. There are 2 ways that we save seeds from these varieties and both require not much work or involvement.
1. Select the about to open flowers on the plant at 2 different positions and cover with a small (lunch size type) paper bag. I've found the white ones work better in letting more sun in but don't 'breathe' as well as the brown ones. Or you can use an old pair of thin leggings/pantyhose that have no holes, which can be risky since pollen can slip in the tiny holes.
2. When the flowers open, use a small, clean paint brush or cotton ended swab to hand pollinate the flowers. Cover back up and let them do their thing.
3. When fruits form, remove the bags, label the fruit, we usually use a piece of yarn tied around the stem for this.
4. Let the fruit ripen, I mean really ripen on the vine. Collect and process as you would seeds (which is another thread).
Hope this helps.
Carlos
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