I had a saggy elastic band on my Traveler's Notebook in passport size. You can buy a repair kit and fix it, but in this video I show you how you can fix a saggy elastic band without the repair kit.

Timestamps:
00:00 - Introduction
00:15 - Problem with the repair kit
00:46 - Fixing the saggy string
05:25 - Be careful with the page marker
06:01 - The end result
06:16 - Applying Renapur