Flying LAS-RNO today on WN. I use a Tom Bihn 3D Clear 1-Quart Organizer Cube for my liquids, http://www.tombihn.com/page/001/PROD/ACC/TB0917, which is great and doesn't frequently wear out like Zip-Loc bags. This is similar to the bag that WN sent out to customers a few years ago, only Tom Bihn makes a much better product and it is made in the US. At the check-point, a TSA supervisor tells me that liquids can only be in a 1-Quart Zip-Loc or Zip-Loc-type bag and nothing else, due to a heightened level of security at LAS. When I asked for more details, including how there was an increased risk in using a Tom Bihn CLEAR cube for liquids versus a Zip-Loc, he could only reply with "This is a new rule from the Federal Security Director at LAS." The logic escapes me as to how the two bags differ from a security/safety standpoint. Has anyone else experienced this at a check-point?