The OS-Base is an 'over the seat harness' which allows OS-6, OS-12 or OS-18 Adventure packs to be mounted as panniers. The modular design enables you to modify your luggage set-up to suit your ride - from a day's single track to longer adventure trips. By adding an additional OS Pack as a top bag, you have a possible 100% waterproof, highly durable carrying capacity of up to 54 litres.

The flexible design of the OS-Base also enables you to mount earlier model Overlander 15 packs as panniers, US-Drypacks as top bags and includes 'Loop Mounts' to attach a tent or sleeping mat. After the initial set-up, it's quick and easy to put on and take off and the heavy-duty hypalon construction with a semi rigid polypropylene core is very stable and lightweight.

Features Original:

• Carrying capacity from 12 to 54 Litres with centre pack mounting option
• Heavy-duty Hypalon construction
• Quick & easy to put on/take off
• Reinforced stitching on all stress points
• Aircraft grade alloy hooks
• Non-slip cam buckles
• 2 x OS-Rack Loops included
• 10 Year Guarantee

Features ADV:

• Fits most adventure bikes with or without grab handles or rear racks
• Supports 12L to 54L capacity using OS-6, OS-12, or OS-18 Adventure Packs
  
• Rackless design—no extra frames or hardware required
  
• Constructed from heavy-duty Hypalon with reinforced stitching
  
• Includes 4 OS-Rings, 4 subframe loops, and 2 EVA foam pads for protection
  
• Aircraft-grade alloy hooks and high-grip buckle adjusters for secure mounting
  
• Quick-release cam buckles for fast, tool-free installation
  
• Lightweight and durable design built to last across multiple bikes

Features Dirtbike: