Here are a couple of helpful hints from Windowbook

As we described in an earlier e-tip, the United States Postal Service modified the regulations for letter size booklet type mailings, sometimes referred to in the printing industry as slim-jims. The new regulations went into effect on September 8, 2009, but there were issues with some smaller size mailpieces which could not accommodate the new tabbing requirements without overlapping the tabs.

As a result, the USPS has issued revised regulations, which now offer a two tab option for pieces that are no more than 4 inches in height or 8 inches in length. The USPS terms these pieces as Simple Spine-Wallet Style. The two tab option is only available for pieces weighing 2.5 ounces or less.

These new revisions are effective October 5, 2009.

The chart in this PDF shows the inclusion of the new wallet style pieces and is an excellent visual guideline for mailers.

As always, we recommend that you work with your local Mailpiece Design Analyst to insure your mailpieces are in compliance. For more detailed information regarding these changes, please refer to the September 10, 2009 Postal Bulletin.