Direct: (503) 987-4002
Main: (503) 987-4000




The RotopaX 3 Gallon Extension is the stacking hardware you need to add a second container on top of the 3 Gallon RotopaX, the 3.5 FuelpaX, or the 4.5 FuelpaX. It lets you expand the capacity of your existing setup on a single mount point without adding additional mounting hardware or taking up extra rack space. If you are already running one of those three containers and want to stack a smaller pack on top — a 1 gallon, 2 gallon, or storage pack, for example — this is the extension that makes it possible.
The extension connects the top of the base container to the bottom of the second pack and holds the two together in a secure, stacked configuration on one mount. It is a clean, purpose-built solution for building out a higher-capacity setup without cluttering your rack with multiple separate mounts. The stacked assembly stays on the same Standard, DLX, or LOX pack mount used for the base container.
One important compatibility note that is worth reading carefully before ordering: the 3 Gallon Extension is specifically for stacking a container on top of the 3 Gallon, 3.5 FuelpaX, or 4.5 FuelpaX. If you are trying to stack the 3 Gallon on top of a 1, 2, or 4 Gallon pack, you need the standard 1, 2 and 4 Gallon Extension instead — not this one. Getting the right extension for your specific stacking configuration matters. This product is currently on backorder — confirm availability before ordering.
We ship throughout the United States. Most in-stock items leave our shop within 1–3 business days. Made-to-order, special-order, drop-shipped, freight, and oversized products may require additional processing or lead time. Any known special timing or availability information will be noted on the product page when applicable.
Orders placed outside of our normal business hours will be processed as soon as possible once our team returns during regular operating hours, Monday–Friday. Orders placed over the weekend or on a holiday will begin processing the next business day.
Eligible items may be considered for return within 30 days of delivery. All returns require prior authorization from PAD Overland. Return requests are subject to our return policy as well as any applicable manufacturer or supplier return requirements.
Approved customer-requested returns are subject to a 35% PAD Overland restocking fee, plus any additional return-related fees imposed by the manufacturer, supplier, or distributor.
Many products sold by PAD Overland include a manufacturer warranty. Warranty claims are subject to the individual manufacturer’s warranty terms and procedures. We are happy to help facilitate the process when possible. Please contact us with your order number, photos, and a description of the issue.
Questions about fitment, shipping, return eligibility, or a special-order product? Please contact us before placing your order. Our team is happy to help make sure you are ordering the correct product for your vehicle.
Thanks for subscribing!
This email has been registered!
Please read our full Terms of Service and Refund Policy.