MAKING THE BAG
Here's a drawing and some photos of the starter making bag:
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The bag is intended for use with a heat seal/vacuum Food Saver Gizmo.  I used the ones sold in 8" wide rolls.   The top and bottom were heat sealed on the Food Saver gizmo.  Size the opening in the top so the stopper is a tight fit.  The stopper is the smaller one (cat. # Q38) available from Williams Brewing (a good outfit IMHO). Only 90 cents. I think it's made of silicone since it takes the steam from boiling well and allows the steam from boiling the wort to escape easily while at the same time sanitizing it. What I like about it is that it's said to block or trap any nasties that might enter the bag during cooling or while handling.  A key ingredient is Foam Control (cat. #CMFMC from  HopTech, $5.95 for 2 ozs.)  It's advertised for use during fermenting but HopTech has said via email that it'd OK to use it during boiling. It works great- absolultely no foam when only 2 drops are used in 20 oz of wort.

I made a stand for the bag out of a yellow plastic Nestle Kuiw container- it's kinda rectangular in shape with rounded edges.  I cut out openings so I could see the starter at work.