Personally I like and use this one:
http://www.midwayusa.com/product/939221689/midwayusa-competition-range-bag-system
It also goes on sale frequently.
BTW, if you are in MA, understand that trigger locks do NOT meet the legal requirement for transportation. I had D-rings installed and use padlocks to secure the bag for transport.
Len, if I have a soft pistol case with the rings in the zippers and use a TSA cable lock(1/8 diameter cable), will this satisfy the Ma. requirement?