What Size Tank Bag Do I Need for ADV Riding?

A tank bag can be the most useful bit of luggage on your bike - or the thing that gets in your way every time you stand up. Ask yourself, what size tank bag do I need, and the honest answer is: probably smaller than you think.

For real ADV riding, the goal is not to fill every spare litre. It is to keep the gear you need most within reach without turning the tank area into a soft, wobbling obstacle. A good tank bag stays low, sits tight and does not interfere with your body position when the track gets rough.

What Size Tank Bag Do I Need?

Most adventure riders land in one of three useful size ranges: compact, mid-size or large. The right one comes down to how you ride, what you need to reach quickly and how much time you spend standing on the pegs.

A compact tank bag, around 3 to 6 litres, suits day rides, technical trails and rally-style riding. It has room for the essentials: mobile, wallet, keys, sunglasses, snacks, a small tool kit, charging cable and maybe a light layer. It keeps weight low and leaves plenty of space to move forward on the bike.

A mid-size bag, roughly 7 to 12 litres, is the sweet spot for many riders doing full days and weekends away. You can carry a larger water bottle, gloves, maps or a GPS backup, food, a camera and wet-weather bits. It is enough capacity to be genuinely useful without becoming a chest-high wall when you are climbing a rocky hill.

Large tank bags, generally 13 litres and up, make sense for mostly road-based touring or bikes with very long tanks and relaxed ergonomics. On a big ADV bike, they can swallow a lot of gear. That is also the problem. Fill one up, hit corrugations or single-track, and you have extra weight sitting high and forward. It can affect steering feel, block your view of the dash and push into you when you need to get over the front of the bike.

For mixed-surface travel, bigger is rarely better. Put bulky gear in your rackless luggage or a roll bag. Keep the tank bag for things you need while riding or at quick stops.

Start With Your Riding, Not a Capacity Number

There is no perfect litre figure for every bike and rider. Start by looking at your actual trips.

If you are doing a hard day in the bush on a Ténéré 700, 890 Adventure or similar midweight bike, a compact bag is usually the better call. You will be standing often, moving your knees around the tank and shifting your weight forward in sand, ruts and steep climbs. A tall or wide bag becomes annoying fast.

If your trips are long days on gravel roads with the occasional rough section, a 7 to 10-litre bag can work well. It gives you enough space to avoid digging through your rear luggage every time you stop, while still keeping the cockpit manageable.

For multi-day remote travel, do not automatically buy the biggest tank bag available. Your trip may be longer, but your tank bag does not need to carry your camp. Tent, sleeping kit, cooking gear, spare clothes and tools belong lower and further back in a properly secured luggage system. The tank bag should carry valuable, frequently used and weather-sensitive items.

That means your multi-day tank bag could still be only 5 litres. The rest of the luggage setup matters more than making one bag do every job.

Check Fit Before You Buy

Capacity is only half the job. A 6-litre bag with a poor shape can feel worse than a 10-litre bag designed to sit low and narrow.

First, look at the tank shape. Modern ADV bikes have wide plastic shrouds, stepped seats, steep tank sections and fuel caps in different positions. A bag needs a stable mounting area and straps that do not slide over plastic panels. If it hangs over sharp edges or rests on textured trim, it will move eventually.

Then get on the bike in your normal off-road position. Stand up. Grip the bike with your knees. Move forward as if you are dropping into a sandy corner or loading the front wheel on a climb. If the bag catches your thighs, forces your knees wide or stops you moving forward, it is too big for that bike and riding style.

Also check the bars at full lock. A tank bag should not foul the controls, crush cables or make tight turns awkward. This matters in car parks, but it matters far more when you are picking through rocky switchbacks with a loaded bike.

Height matters as much as width. Tall bags are tempting because they offer easy litres, but they put weight above the fuel tank and can block your view of the instruments. Low-profile luggage is usually the smarter option off-road.

Pack the Tank Bag Like It Matters

A tank bag works best when it is packed with a purpose. Do not use it as the place where random gear goes to disappear.

Your frequently used gear belongs here. Think mobile, wallet, keys, fuel card, earplugs, snacks, sunscreen, clear glasses, charging lead, small first-aid items and paperwork. If you carry a camera, keep it protected and make sure it does not become a hard lump against the tank.

Avoid carrying heavy tools, spare tubes, large locks or big water bottles in the top of the bag. Those items add weight where you feel it most. They also make the bag unstable when the riding gets rough. Put dense gear low in your main luggage, close to the bike’s centreline.

Water is the common exception, but even then, think about the setup. A hydration pack keeps water off the bike and is often better for technical riding. A small bottle in the tank bag is fine for easy access, but a couple of litres up high is not the answer to every trip.

Tank Bag Size by Trip Type

For a short local ride, 3 to 5 litres is plenty. Carry the basics, a snack and a light emergency layer. You should barely notice it is there.

For a full-day adventure ride, 5 to 8 litres gives more flexibility. You can add food, spare gloves, a compact rain shell and the little items that keep a long day moving.

For an overnight or weekend ride, 7 to 10 litres is usually enough if the rest of your luggage is sorted. You may want room for chargers, camera gear, documents, extra food and items you want away from dust or rain.

For extended touring, use the same logic rather than simply adding litres. A 10 to 12-litre bag can be useful on long transport sections, but only if it stays out of your way when the route turns rough. If your route includes serious off-road riding, a smaller tank bag paired with stable rackless luggage is the better setup.

Do Not Ignore Mounting and Materials

A tank bag that moves is not just annoying. It wears on the bike, distracts you and can shift at exactly the wrong moment. Look for a mounting system that holds the bag firmly without relying on loose straps flapping around the tank. Check that refuelling is simple too. If filling the bike becomes a full unpacking job, you will hate it by day three.

Weather protection matters, especially on remote rides where your phone, documents and electronics cannot afford a soaking. Welded TPU construction is a better fit for hard use than bulky PVC gear or fabric bags that depend on a separate rain cover. Less bulk, fewer layers and no cover to lose in the wind.

The same thinking sits behind Nomad Moto gear: keep the load tight, keep the weight down and build it for the part of the ride where shiny gear usually gets found out.

The Best Size Is the One You Forget Is There

A tank bag should make life easier at fuel stops, lunch breaks and roadside fixes. It should not change how you ride. If you are constantly brushing it with your knees, fighting it on steep descents or loading it up just because there is room, scale back.

Choose the smallest size that carries your genuinely needed, regularly accessed gear. Put the rest low and secure in the right luggage system. When the track gets ugly, you will be glad the tank area is clear and the bike still feels like a bike.