Bike saddle bags for road and bikepacking

Small under-seat bag or bikepacking saddle bag?

The under-seat bag slips between the rails and the seatpost, discreet and light: it is the repair kit that stays permanently on a road bike, gravel bike or mountain bike. The bikepacking saddle bag, or seat pack, extends the saddle backwards in a long cylinder attached to the rails and the post. With no rack needed, it suits carbon frames and road and gravel bikes alike, and carries the volume of a classic rear pannier for less weight.

What capacity should you choose?

• Less than a litre: an inner tube, two tyre levers, a multi-tool and a CO2 cartridge. The format for road rides.
• From 1 to 3 litres: room to add a rolled-up windproof jacket, keys and a cereal bar, for long rides.
• From 5 to 10 litres: a warm layer, a rain jacket and the food for a day of gravel riding or a light trip staying in hotels.
• From 10 to 18 litres: bikepacking volume, for a compact sleeping bag or clothing for several days.

A well-filled bag is better than a large, half-empty one that sways. Some models expand, others compress with a roll-top closure.

Straps, clip or adapter: how does a saddle bag attach?

Hook-and-loop straps, passed around the rails and the seatpost, suit almost every saddle and add little weight. A clip or adapter system is fitted once under the saddle and lets you remove the bag in one movement, handy for keeping it with you during a stop. For large volumes, a harness or a rigid holder attached to the rails takes a removable dry bag: you slide it out of its cradle without undoing all the straps.

Stability, waterproofing and compatibility

A loaded bikepacking saddle bag tends to sway when you ride out of the saddle. Put heavy, dense items against the saddle, tighten the compression straps and keep the rest in a frame bag, which sits more centrally. Check the space between the saddle and the rear tyre, reduced on a small frame or a full-suspension mountain bike, and the length of exposed seatpost. A dropper post greatly limits the usable travel, unless you use a holder designed for it.

A water-resistant bag withstands rain, while a waterproof bag, with welded seams and a roll-top closure, also copes with spray from the rear wheel. As it often hides the seatpost, plan for a rear light attached to the dedicated loop on the bag or to the seatstay.

Other bags and pannier racks

At the front, handlebar bags keep the essentials within reach. For heavier loads, a pannier rack and pannier bags remain the most stable solution. All storage solutions are in bike bags and luggage.

Bike saddle bag brands

Topeak, a Taiwanese accessories manufacturer, offers the Aero Wedge Pack with its QuickClick mount, from Micro to Large, and the BackLoader in 6, 10 or 15 litres for bikepacking.

Klickfix, which produces its adapters in Solingen, Germany, pairs its Micro bags, from 0.2 to 0.8 litres, and Max Sport bags with a clip adapter that stays under the saddle.

Zefal, headquartered in Jargeau, in the Loiret in France, makes the water-resistant Z Adventure in 5, 11 or 17 litres and the Z Light for tools.

Acepac, a Czech brand specialising in bikepacking, makes the Saddle Bag MKIII and the 8-litre Saddle Dry.

Pro, Shimano's accessories and components brand, offers the Performance from small to XL and the Discover, including a 10-litre Team Gravel version.

VAUDE, a German family business based near Tettnang, covers every format, from the Tool and Race Light bags to the 6 and 10.5-litre Trailsaddle and the 15-litre Trailsaddle Cage, mounted on a holder.

Bike saddle bags on sale

Discontinued colours and formats go through bags and luggage clearance; newly listed bags appear among new arrivals. Make the most of the seasonal sales to get ready for a first cycling trip.

Frequently asked questions

What should you put in a bike saddle bag?

The repair essentials: an inner tube or tubeless plugs, tyre levers, a CO2 cartridge or mini pump, a multi-tool with a chain tool and a quick link. Add a little cash and some ID and, in a large bag, a warm layer.

Saddle bag or frame bag for bikepacking?

The two complement each other. The frame bag, low and central, takes heavy items; the saddle bag takes light, bulky items, such as clothing or a sleeping bag.

Is a saddle bag compatible with a dropper post?

A small under-seat bag is, as long as it stays above the collar when the post drops. A large bikepacking saddle bag, on the other hand, blocks part of the travel, unless it is a model designed for dropper posts.

How do you stop a saddle bag from swaying?

Fill it completely, load the heaviest items against the saddle, tighten the rail and seatpost straps, then compress the remaining volume. A rigid holder under the saddle gives the best stability.

Can a saddle bag replace pannier bags?

For a light trip, yes, together with a frame bag and a handlebar bag. To carry a tent, a stove and clothing for several weeks, pannier bags offer more volume.