1. Introduction
The Rhinowalk MT21620-1 is a versatile 20-liter waterproof motorcycle saddle bag designed for secure mounting on a motorcycle's rear rack, passenger seat, or as a trunk bag. Its robust construction and modular design offer flexible storage solutions for various travel requirements. This manual provides essential information for the proper setup, operation, and maintenance of your saddle bag.
2. Product Features
- Material: Constructed from durable Polyester for longevity.
- Modular Design: Allows for combination of multiple bags (2-in-1, 3-in-1, 4-in-1) using integrated buckles and hooks, adapting to different storage needs.
- Waterproof Inner Bag: Features a fully waterproof, removable inner bag with a zipper closure, providing protection against rain and moisture.
- Anti-slip Net Bag: An external net bag is included for hanging wet clothes or other items, enhancing friction and stability during rides.
- Enhanced Protection: Equipped with a waterproof zipper cap to prevent rain intrusion and durable brand buckles for secure fastening.
- Visibility: A silver reflective logo improves safety during night riding conditions.
- Versatile Use: Can be utilized as a motorcycle pannier bag, fuel tank bag, shoulder bag, or backpack by attaching the included shoulder straps.
3. Package Contents
Please verify that all items are present in your package:
- 1 x Rhinowalk MT21620-1 20L Motorcycle Saddle Bag
- 4 x Buckles (for attachment)
- 4 x Bands (straps for securing)
- 2 x Shoulder Straps (for backpack/shoulder bag conversion)

Figure 3.1: Main product view with dimensions and accessories.
4. Setup Instructions
4.1 Mounting as a Single Bag
- Position the saddle bag on your motorcycle's rear rack or passenger seat.
- Utilize the provided bands (straps) and buckles to secure the bag firmly to the motorcycle. Thread the straps through the designated loops on the bag and around stable points on your motorcycle (e.g., frame, rack).
- Tighten all straps to ensure the bag is stable and does not shift during travel.

Figure 4.1: Single bag mounting steps.

Figure 4.2: Example of a single bag mounted on a motorcycle.
4.2 Modular Combination (Multiple Bags)
The modular design allows you to combine multiple Rhinowalk bags (10L, 20L, 30L variants) to create larger storage systems (e.g., 2-in-1, 3-in-1, 4-in-1).
- Identify the connection points (buckles and hooks) on each bag.
- Align the bags as desired for your combination (e.g., side-by-side, stacked).
- Connect the bags using the integrated buckles and hooks. Ensure all connections are secure.
- Once combined, use the additional bands and buckles to secure the entire assembly to your motorcycle, distributing weight evenly.

Figure 4.3: Modular combination steps for multiple bags.
5. Operating Instructions
5.1 Accessing Storage and Waterproofing
The main compartment features a roll-top closure for primary weather protection and a removable, zippered waterproof inner bag for critical items.
- To open, unclip the roll-top buckles and unroll the top opening.
- The inner bag can be accessed via its zipper. For maximum waterproofing, ensure the inner bag's zipper is fully closed and the main roll-top is rolled down at least three times and secured with the buckles.
- The inner bag is removable for easy cleaning or separate use.

Figure 5.1: Waterproof inner bag.

Figure 5.2: Inner bag zipper and sealed seams.
5.2 Using the Anti-slip Net Bag
An external net bag is provided for temporary storage of wet items or for items requiring quick access. This net also contributes to the bag's stability by increasing friction.
5.3 Converting to Shoulder Bag or Backpack
Attach the two provided shoulder straps to the designated D-rings or loops on the bag to convert it into a shoulder bag or backpack for off-motorcycle carrying.

Figure 5.3: Bag used as a backpack.
6. Maintenance
- Cleaning: Wipe the exterior of the bag with a damp cloth and mild soap if necessary. Avoid harsh chemicals or abrasive cleaners.
- Drying: Ensure the bag is completely dry before storing to prevent mold or mildew. Air dry in a well-ventilated area, away from direct sunlight or heat sources.
- Storage: Store the bag in a cool, dry place when not in use.
- Waterproof Inner Bag: Periodically check the inner bag for any signs of wear or damage to maintain its waterproof integrity. Ensure the zipper is clean and functions smoothly.
7. Troubleshooting
- Water Leakage: If water enters the bag, first check that the waterproof inner bag's zipper is fully closed and the main roll-top closure is rolled down at least three times and securely buckled. Inspect the bag for any punctures or tears.
- Bag Instability: If the bag feels unstable during riding, re-tighten all mounting straps and buckles. Ensure the weight inside the bag is distributed evenly. Avoid overloading the bag beyond its capacity.
- Difficulty Attaching: Review the setup instructions carefully. Ensure straps are routed correctly through all loops and buckles. If using modular combinations, verify all connecting buckles are properly engaged.
8. Specifications
| Model Number | MT21620-1 |
| Capacity | 20 Liters |
| Dimensions (L x W x H) | 26 cm x 18 cm x 59 cm (10.24"L x 10.24"W x 23.23"H) |
| Weight | 920 g |
| Material | Polyester |
| Water Resistance | Waterproof |
| Closure Type | Roll-top (main compartment), Zipper (inner bag) |
| Mounting Type | Seat Mount |
| Color | Black |
9. Official Product Video
Video 9.1: Official product video demonstrating the features and usage of the Rhinowalk Motorcycle Pannier Bag. Duration: 1 minute 52 seconds.
10. Warranty and Support
For specific warranty details, return policies, or technical support regarding your Rhinowalk MT21620-1 Motorcycle Saddle Bag, please refer to the documentation provided at the time of purchase or contact Rhinowalk customer service directly through their official website or the retailer from whom you purchased the product. Please retain your proof of purchase for any warranty claims.