The size of your current stomach is quite variable, as much of it is stretchy (to accommodate those Thanksgiving dinners!) so putting a number on that is difficult - how full is it at the moment, and how much as an individual stretched out their stomach? A more typical quoted capacity is around 1000cc, but due to its stretchiness, 2000cc or more can be accommodated if stuffed. When empty, its' capacity can easily be down in the neighborhood of our sleeved stomachs, but the VSG take away most of that stretchy tissue.
There are also some variables involved in determining what your final capacity will be. Many use this bougie that you hear about as a guide, the smaller the number the smaller the stomach - sorta. That depends on how tightly the surgeon forms the sleeve around the bougie, and how long your stomach is (some people's stomach will wind up being longer or shorter, though the diameter of the sleeve is the same as others'.) Many docs will measure the capacity during surgery as part of an initial leak test while they're in there.
A 100cc stomach sounds to be on the large side to me for a stand alone VSG; my sleeve was about 2.5 oz at surgery (call it 70cc) while my doc usually does larger sleeves of around 4 oz (113cc) for his DS patients. These measurements may not be directly comparable, as docs can measure things differently, so take that comparison with a grain of salt.
Short answer here is that we can hear all kinds of numbers, and many of them won't be directly comparable with other numbers that we hear, so direct comparisons are difficult. The most important thing is what the final outcome of the surgery is once everything is healed up, which is that most of us can be comfortably satisfied with enough dense protein (meats and such) along with other healthy foods to live healthy satisfying lives, though there is a learning curve involved and caution still needs to be used to avoid drinking excess calories and limiting junk which tends to be less restricted.
1st support group/seminar - 8/03 (has it been that long?)
Wife's DS - 5/05 w Dr. Robert Rabkin VSG on 5/9/11 by Dr. John Rabkin