Portland Design Works Tracker Keeper Stealth Saddle Stash Hide An Apple Airtag The Tracker Keeper is a stealth saddle stash that hides an Apple Airtag or similarly-sized tracking device under your bike saddle so that you can make sure no one is wandering off with your ride. Plus, they're made from waterproof, 100% recycled Eco Pak ballistic fabric scraps from making Portland Design Works Loot Bags, turning small pieces of leftover material into something useful. Features Hides an Apple Airtag or similarly-sized tracking device under your bike saddle Dimensions: 50 x 45mm Weight: 6. 5g | Portland Design Works | Tracker Keeper Stealth Saddle Stash Black