Starting December 31, 2015, you won't be able to add pages to your U.S. passport. Once your pages are filled with stamps, the U.S. Department of State will require you to renew your passport — and we all know how fun that is.
If you want to add pages without renewing, you have until the cutoff date of December 18. Some silver lining: after the 18th, all passports issued will include feature more durable construction (extra pages were more prone to falling out) and 52 pages, up from the current standard of 32. By adding 20 extra pages, the Department of State is hoping that you won t run out of room to use during the 10 years that your passport is valid.
For those who do travel frequently, 52 pages may still not be enough. And without the opportunity to add pages, keeping your passport valid is going to be costly. Luckily, you have plenty of time to take action before the deadline.
If you want to maximize your current passport, renew it (you are going to have to renew eventually anyway) for $140, and pay the additional $82 fee to add the maximum of two new sets of pages. Then you have yourself a 96-page passport for the next 10 years. That's a much better deal than running out of pages after next year's holiday season and ponying up $140 for your new — and limited — 52-pager.