Companies that make travel products have also built market share amid TSA restrictions. Laptop-bag makers now frequently tout that their zippers allow east access and are "checkpoint friendly." According to the TSA, travel-ready bags include the following features: a designated laptop-only section you can lay flat on the X-ray belt; no metal snaps, zippers or buckles inside, underneath or atop the laptop-only section; and no pockets inside or outside the laptop-only section. Toiletry makers have also hit the market with specially designed 3-ounce containers that meet carry-on liquid restrictions. (Because the U.S. isn't on the metric system, the TSA technically allows 3.4 ounces -- which rounds nicely as 100 ml for foreign travelers.) -- Written by Joe Mont in Boston. >To contact the writer of this article, click here: Joe Mont. >To follow the writer on Twitter, go to http://twitter.com/josephmont. >To submit a news tip, send an email to: email@example.com.