The Pannier Stabilizing Insert reinforces the bottom and back of your bicycle bag, ensuring stability when parked. It also cushions the lower part of the bag, not only waterproofing your gear but also protecting it from shocks.The bright nylon fabric allows you to easily see the contents of the bag, making it a breeze to find your equipment.This handy insert is compatible with all Back-Roller models and products with a similar shape, such as Bike-Packers and Velo-Shoppers, starting from the 2024 model year.For 2023 models or older, you can easily retrofit them for the use of the Pannier Stabilizing Insert with the Retro Fit Kit Stabilizing Insert (F3912).