Jerry Can Alternatives: Portable Gas Cans, Fuel Bladders And Onboard Auxiliary Tanks Compared

This article is part of our Jerry Cans Guide.

A Jerry can is still one of the most recognized ways to carry extra fuel, but it is not the only option. Depending on how you drive, where you travel, and how much fuel you need to carry, a standard steel or plastic can may be less convenient than a modern portable gas can, a collapsible fuel bladder, or a permanently mounted auxiliary tank.

For DIY car owners, the right choice usually comes down to four things: capacity, storage space, ease of pouring, and safety. A weekend off-roader may want something compact and easy to strap down, while a truck owner covering long distances may be better served by an onboard tank that feeds the main system. What works well for emergency backup fuel is not always the best solution for overlanding, towing, or work use.

This comparison breaks down the most common Jerry can alternatives, explains where each one makes sense, and highlights the tradeoffs that matter most in the real world. If you are deciding between portability and capacity, or between lower cost and long-term convenience, this guide will help narrow it down.

Why Drivers Look for Alternatives to a Jerry Can

Traditional Jerry cans are popular because they are durable, stackable, and relatively simple. But they also have limitations. They can be heavy when full, awkward to pour without a spout or funnel, and bulky to store when empty. Some drivers also want a solution that carries more fuel, fits a specific mounting setup, or reduces the hassle of manually transferring fuel.

• You need more capacity than one or two cans can provide.
• You want something easier to store in a trunk, truck bed, or overland setup.
• You want faster or cleaner fuel transfer with less spill risk.
• You want a setup better suited for long-distance travel, work trucks, or off-road use.
• You are trying to balance price, legality, weight, and convenience.

The best alternative depends less on what is trendy and more on how often you carry fuel. If it is only for emergencies, a compact approved gas can may be all you need. If extra range is part of every trip, a more integrated solution starts to make sense.

Portable Gas Cans

What They Are

Portable gas cans are the most direct alternative to a Jerry can. They are usually made from high-density plastic, sometimes steel, and are sold in common sizes like 1, 2.5, 5, and sometimes 6 gallons. Many are designed to meet current EPA and CARB requirements, which is why newer cans often use self-venting or safety spouts.

Best Use Cases

• Emergency backup fuel in a garage or vehicle
• Small engines, lawn equipment, generators, and occasional vehicle refueling
• Budget-conscious drivers who need a simple, legal option
• Situations where you want easy replacement and broad retail availability

Pros

• Usually the lowest-cost alternative
• Easy to find at auto parts stores, hardware stores, and big-box retailers
• Lighter than steel when empty if made from plastic
• Available in several capacities for different storage limits
• Good for occasional use and emergency preparedness

Cons

• Many newer spouts are slow or frustrating to pour
• Bulky even when empty
• Plastic cans can swell, stain, or degrade with age and UV exposure
• Less rugged than quality metal Jerry cans in harsh off-road conditions
• Not ideal when you need to carry a lot of fuel regularly

If you mainly want a practical replacement for a Jerry can without changing your whole setup, portable gas cans remain the easiest entry point. Just pay close attention to certification, cap sealing, and how securely the can can be tied down in a vehicle.

Fuel Bladders

What They Are

Fuel bladders are flexible containers made from reinforced fuel-resistant materials. They are designed to hold gasoline or diesel temporarily and can often be rolled or folded when empty. Some are meant for motorsports or off-road use, while others are sold specifically for overlanding and emergency fuel transport.

Best Use Cases

• Overlanding trips where space matters more than rigid durability
• Temporary extra fuel capacity for specific routes
• Truck beds, roof racks, or cargo areas where a shaped rigid can is hard to fit
• Drivers who want a container that stores compactly after use

Pros

• Excellent space efficiency when empty
• Can offer larger capacity without needing several hard containers
• Useful in cargo layouts where rigid cans waste space
• Often easier to pack around other gear for one-time trips

Cons

• Usually more expensive than a basic gas can
• Can be awkward to fill, move, and pour when full
• More vulnerable to puncture, abrasion, and improper handling
• Not the best choice for long-term fuel storage
• Quality varies a lot, and cheap bladders are a major risk

A fuel bladder is best thought of as a special-purpose solution, not a universal replacement. It shines when you need temporary range and do not want to dedicate permanent space to rigid containers. For everyday use, it is usually less convenient than a standard can.

Onboard Auxiliary Tanks

What They Are

An onboard auxiliary tank is a permanently or semi-permanently mounted fuel tank installed in a truck bed, underbody, or other approved location. Depending on the design, it may feed the main tank through a transfer system or simply store extra fuel for controlled transfer. These systems are most common on pickups used for towing, long-distance driving, ranch work, or expedition travel.

Best Use Cases

• Drivers who routinely need significantly more driving range
• Tow rigs and diesel trucks covering remote or high-mile routes
• Work trucks that burn fuel daily and benefit from fewer fill-ups
• Serious overland builds where mounted cans are no longer enough

Pros

• Far more capacity than portable cans or most bladders
• Cleaner and more convenient for regular use
• Reduces the need to manually lift and pour heavy containers
• Can improve trip planning and fuel-stop flexibility
• A better long-term solution for high-mileage drivers

Cons

• Highest upfront cost by a wide margin
• Installation complexity is much greater
• May require vehicle-specific hardware, plumbing, and compliance checks
• Can reduce bed space or add vehicle weight
• Not practical for drivers who only occasionally need extra fuel

If you carry extra fuel frequently, an onboard auxiliary tank can be the most convenient option overall. But it only makes financial sense when your need for added range is regular, predictable, and worth the permanent tradeoff in cost and space.

Side-by-side Comparison

Here is the short version of how these options compare against a traditional Jerry can.

• Portable gas cans: Best for low cost, occasional use, and easy replacement. Weakest for ruggedness and pour convenience.
• Fuel bladders: Best for temporary extra capacity and compact storage when empty. Weakest for durability, simplicity, and long-term use.
• Onboard auxiliary tanks: Best for maximum range and convenience on frequent trips. Weakest for price, installation effort, and flexibility.
• Jerry cans: Best middle ground for rugged portability and proven utility. Weakest for weight, manual handling, and limited capacity per container.

Quick Buying Logic

• Choose a portable gas can if you need emergency fuel a few times a year.
• Choose a fuel bladder if you need temporary range for a trip and want it out of the way when empty.
• Choose an auxiliary tank if extra fuel is part of your regular driving routine.
• Stick with a Jerry can if you want a rugged, portable option that still works well off-road and in mixed-use situations.

Safety, Legal, and Storage Considerations

Fuel storage is not just about convenience. Carrying gasoline or diesel in a passenger vehicle, SUV, or truck introduces safety and legal considerations that matter as much as capacity. Always check state and local rules, the container manufacturer’s instructions, and your vehicle’s cargo and ventilation limitations.

• Use only approved containers rated for the fuel type you are carrying.
• Secure the container so it cannot slide, tip, rub through, or strike other cargo.
• Avoid storing fuel inside a hot passenger compartment whenever possible.
• Keep fuel away from sparks, batteries, open flames, and direct exhaust heat.
• Do not overfill; leave room for thermal expansion.
• Inspect caps, seals, spouts, hoses, and fittings regularly for leaks.
• For onboard tanks, confirm compatibility with your vehicle and applicable regulations before installation.

One of the biggest mistakes DIY owners make is choosing the right product category but the wrong quality level. A cheap container with weak seams, poor venting, or a bad cap is rarely worth the savings. With fuel, reliability matters more than bargain pricing.

How to Choose the Right Alternative for Your Vehicle

Think About Frequency First

If you only carry fuel a few times a year, buying a permanent system may be overkill. If you carry fuel every week, lifting cans and managing spouts will eventually get old. Your usage pattern should drive the decision.

Match Capacity to Space

Do not buy based only on gallon count. Think about where the container will actually ride. A fuel bladder may fit better in a truck bed for one trip, while a rigid can may be safer and more manageable in a dedicated rack. Auxiliary tanks make the most sense when the vehicle can support the added weight and packaging.

Consider Transfer Convenience

The difference between a smart buy and an annoying one often comes down to the refill process. Heavy cans and soft bladders can be difficult to control. If you routinely transfer fuel by yourself, handling and pour speed matter more than many buyers realize.

Do Not Ignore Long-term Ownership Cost

Portable cans have a low entry price but may need replacement sooner. A high-quality Jerry can may cost more but last longer. An auxiliary tank costs much more upfront, yet can be the most convenient and cost-effective choice for high-use drivers over time.

• For emergency-only use, buy a quality approved portable can.
• For trip-specific extra range, consider a reputable fuel bladder.
• For frequent long-haul or work use, research a vehicle-specific auxiliary tank.
• For durable all-around portability, a Jerry can still remains one of the strongest balanced options.

Bottom Line

There is no single best replacement for a Jerry can because each alternative solves a different problem. Portable gas cans are the budget-friendly everyday choice. Fuel bladders are ideal when temporary capacity and compact storage are the priority. Onboard auxiliary tanks are the premium solution for drivers who need serious range on a regular basis.

If you want the simplest answer, choose based on how often you carry fuel. Occasional use favors portable cans. Trip-specific range favors bladders. Frequent heavy use favors auxiliary tanks. And if you still want a tough, proven, versatile middle ground, the Jerry can remains hard to beat.

Related Buying Guides

Check out the Jerry Cans Buying Guides

FAQ

Are Portable Gas Cans Safer than Jerry Cans?

Not automatically. Safety depends more on build quality, approval rating, sealing, and how the container is stored and secured. A high-quality approved Jerry can can be safer than a poorly made plastic can.

Can I Keep a Fuel Bladder Full in My Vehicle All the Time?

That is generally not the best use for a fuel bladder. Most are better suited for temporary transport rather than long-term storage. Always follow the manufacturer’s directions on fill duration, temperature limits, and storage conditions.

Is an Auxiliary Fuel Tank Legal on a Pickup Truck?

It can be, but legality depends on the tank design, installation method, fuel type, and state or federal requirements. Before buying, verify that the system is intended for your vehicle and complies with applicable rules.

What Is the Easiest Option to Store when Empty?

A fuel bladder is usually the easiest to store when empty because it can be folded or rolled up. Rigid gas cans and Jerry cans still take up nearly the same amount of space whether they are full or empty.

Which Option Is Best for Off-road and Overland Travel?

For rugged repeat use, Jerry cans and quality mounted systems are usually the most proven. Fuel bladders can work well for temporary extra capacity, but they require more care and are not always the best fit for rough, repeated abuse.

Do Newer Portable Gas Cans Really Pour Slower?

Many do. Modern emissions-compliant spouts can be slower or more awkward than older designs. Some buyers accept that tradeoff for legality and safety, while others prefer more rugged can systems with better transfer accessories.