🚴The Ass Rocket – your ultimate companion for bikepacking
Anyone who delves into the topic of bikepacking will inevitably encounter one term sooner or later: "ass rocket ." What sounds funny at first glance is actually a functional and ingenious transport marvel for bicycle tourists . In this article, you'll learn everything you need to know about the ass rocket – from its function and advantages to packing tips and useful accessories.
The good news: At Eddy's Adventure you can flexibly rent many bikepacking bags by the day to try out different models – perfect for micro-adventures or multi-day tours.
What is an ass rocket?
The "Arschrakete" (Ass Rocket) is a large saddlebag that attaches directly under the bicycle saddle. It was specifically designed for bikepacking and replaces the traditional luggage rack. With a typical volume of between 8 and 16.5 liters, it offers ample storage space for clothing, a sleeping bag, a sleeping mat, and even a small tent.
The name "Arschrakete" describes the distinctive shape and position of the bag – it protrudes rearward from the saddle like a rocket and is significantly narrower and more aerodynamic than classic panniers.
Thanks to Stefan for providing the photo.
Here is the direct link to the Ortlieb Seat-Pack 16.5 liter saddlebag in the Eddy's Adventure shop, where you can rent it flexibly by the day:
👉 Rent the Ortlieb Seat-Pack 16.5 L from Eddy's Adventure
Advantages of a rear rocket when bikepacking
The "ass rocket" impresses with a multitude of advantages that make it indispensable, especially for bikepacking:
- Storage & Organization: Plenty of space for clothes, sleeping bag, tent and more – without putting unnecessary strain on the bike.
- Optimal weight distribution: The position under the saddle keeps the center of gravity low and central – this increases riding stability, especially off-road.
- Aerodynamic & efficient: Unlike side-mounted panniers, the "butt rocket" offers less wind resistance.
- Waterproof & robust: Most models are made from durable, weatherproof materials.
- Protective function: It also serves as a splash guard – ideal in rain and muddy conditions.
When and why do you use an ass rocket?
The rear rack is especially useful when you want to travel light and efficiently – without a bulky luggage rack. It's the ideal solution, particularly for gravel bikes, road bikes, or mountain bikes where traditional racks can't be mounted.
Whether it's a weekend trip, a bikepacking adventure or a spontaneous getaway – with a rear rocket you are flexible and independent on the road.
Tips for choosing a butt rocket
Not every bag is equally suitable. When choosing, pay attention to the following points:
- Mounting system: Models from Ortlieb , CYCLITE or Apidura offer stable and intuitive systems that do not slip even on rough terrain.
- Reinforcements: A solid base and stable side walls provide more support.
- Size: Choose your volume depending on the tour duration – 8 l for day trips, 16.5 l for multi-day trips.
- Material: Waterproof, tear-resistant and durable – that's a must.
- Reflectors: For greater visibility in road traffic.
What all goes into the ass rocket?
In practice, a certain division has proven effective. The rear rocket is ideal for light, bulky objects :
✅ Clothing
✅ Sleeping bag
✅ Compact sleeping mat
✅ Small tent
Tip: Many models have elastic straps at the top – ideal for carrying shoes, windbreakers or rain covers within easy reach.
Important: Heavy items such as tools or power banks should be placed in the frame or handlebar bag – this keeps your center of gravity low and the bike stable.
How big does an ass rocket have to be?
The size depends on your individual needs. Common models offer between 8 and 16.5 liters of storage space .
Tip for those who are undecided: It's better to choose a slightly larger size – with a roll-top closure and compression straps, the volume can be reduced if needed. This way you remain flexible, even if your luggage takes up more space than expected.
Why is the butt rocket attached to the saddle?
The placement under the saddle has two crucial advantages:
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Central weight distribution: The bike remains balanced, especially on singletrack trails, descents or in curves.
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Improved aerodynamics: Less wind resistance = more energy for the journey.
What other bags do you need for bikepacking?
For a well-balanced setup, the rear rocket is only one part of the whole. We also recommend:
- Frame bag: For heavy items such as tools or spare parts.
- Handlebar bag: Ideal for a sleeping mat, tent or clothing.
- Top tube bag: For snacks, smartphone, headlamp or power bank.
All the bags together form a well-thought-out system for maximum efficiency and flexibility on tour .
Useful extra tips for using your butt rocket
✔️ Tighten the straps regularly , especially after stops.
✔️ Attach a rear light if the bag covers the original rear light
✔️ Use frame protection film on sensitive areas such as the seat post
✔️ Follow the packing system: Heavy items at the bottom, light items on top
✔️ Use a tension strap for additional equipment
Conclusion: The ass rocket – small, but mighty!
The bikepacking bag is an essential piece of equipment for anyone who wants to travel light, efficiently, and independently by bicycle. It not only offers plenty of space but also improves riding stability and aerodynamics . If you pay attention to a few things when choosing the bag and packing it, nothing will stand in the way of your bikepacking adventure.
👉 Tip from Eddy's Adventure: You can easily rent high-quality saddlebags and bikepacking accessories from us by the day . Test different models at your leisure before making a decision. This way you save money and resources – and can start your next microadventure tomorrow.
Rent bikepacking equipment now – and the adventure begins.
