Like Dave I can't see the reason for bagging tomatoes.
Most of the tomato seeds I grow are seeds that I have collected in various ways e.g.
If I am eating a tomato (from any source) and I like it it is not unknown for me to scrape the seeds into a serviette and fetch them home!
As one who visits a few shows each year I often find the Tomato Growers association are selling their wares to the general public.
Usually they allow you to taste them before you buy! so needless to say;
sometimes the seeds are scraped out and saved! 
Well think of it this way; the human digestive system does not digest tomato seeds so why allow them to end up in some sewer?

Currently my stock contains such varieties as;
Ailsa Craig from a purchased seed packet
Alicante from a purchased seed packet
*Calahonda from a supermarket in Calahonda Spain
*Feurta from a supermarket in Feurtaventura in the Canary Islands
Gardener's Delight was a freebie packet from the BBC Grow your own programme
*Keith's Plum from one of our allotment tenants
*Mammoth from one of our allotment tenants
Moneymaker from a purchased seed packet
*Nectar From Tomato assoc tasting
San Marzano from seed company in Spain
San Pedro from seed company in Spain
Spanish Moneymaker from seed company in Spain
Sub Arctic as I recall these were a freebie from some magazine
*Tatton as the name suggets from tomato association at Tatton Park show
*Vanessa from tomato association at Tatton Park show
*Piccolo from tomato association at Tatton Park show
*Melrow from tomato association at Tatton Park show
What is common with all these varieties apart from Gardener's Delight is; I like the taste.
GD's are for my Grandkids to grow in their back yards!
Many of these I have had for a number of years and those marked * are saved seeds from the original source.
For example I must have had Feurta for 10-15 years now, these are the decendants of the original tomato I bought.
Now back to the thread; here is some info from my website on the subject.
http://www.thegardenersalmanac.co.uk/Data/Collecting%20seed/Collecting%20seed.htmIf nothing else you can use the template to make packets for all those seeds you are going to save!
Method;
Click on template to enlarge it then print it.
Or better still; copy it and paste it as many times as you can onto a blank A4 sheet in a programme such as word or Notepad and save as a template.
In this way you will get a few packets per A4 sheet of paper rather than one!
BTW; I haven't saved any new tomato varieties this year but I have saved seed from one of Tescos finest yellow sweet peppers and a garlic bulb!
There are other things I have saved over the years but too many to mention here!
I will mention 'beans' I never buy these as they are too bl**dy expensive from the seed companies!
Sometimes when I get a special offer of a variety of bean I will kick its equivalent into touch and start saving from the new stock!