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Bike Panniers, Explained

After reading, you'll know how to measure your rack, compare capacities honestly, and spot a bag that will clip your heel.

Updated September 12, 2026 · Companion to our Outdoors & Fitness review

Arkel Dolphin 24L Waterproof Pannier - our top pick
In this guide

Panniers are one of the few bike purchases where the bag can be perfect and still be the wrong buy, because the hooks have to close around your rack. Rack tube diameter varies a lot, e-bike and cargo racks are usually thicker than touring racks, and a good number of pannier mounts stop at 16mm. Sort that out first and the rest of the decision is about fabric, weight and whether your heel clears the bag.

The 30-second version

  • Measure the rack tube first, because many pannier hooks are specified only up to 16mm and e-bike racks are often thicker.
  • Capacity units are not consistent, so convert cubic inches to litres before you compare two bags.
  • Empty weight matters more than it seems, since a pannier rides with you whether or not there is anything in it.
  • Waterproof means two different things, a sealed roll-top bag or a tough shell with a waterproof liner inside it.
  • Heel strike ends more pannier relationships than rain, and it is a function of bag length, shape and how far forward it mounts.

The products this guide is about

Our verdict on each, with the full reasoning on the companion review.

What actually matters

  • Rack tube diameter - the thickness of the tube your hooks clamp onto, measured in millimetres. It is the single spec that decides compatibility, and it is the one most often missing from a pannier listing.
  • Hook and locking system - whether the hooks simply rest over the tube or lock onto it. A locking mount matters on rough surfaces, where an unlocked bag can bounce off.
  • Capacity and its units - litres are the convention, but some makers publish cubic inches. One thousand cubic inches is roughly sixteen litres, so the bigger-sounding number can be the smaller bag.
  • Water protection method - a sealed roll-top keeps water out of the bag itself, while a liner system lets the shell get wet and protects the contents. Both work; they fail differently.
  • Empty weight - what the bag weighs before you load it. Across common panniers this ranges from well under a kilogram to over one and a half, and it is carried on every ride.
  • Shape and heel clearance - long, boxy bags mounted forward catch your heel. A tapered front, a shorter bag or a rack with more setback are the fixes.
  • Shell fabric and denier - 1000d Cordura and coated ripstops behave differently in abrasion and in rain. A published denier figure is a sign the maker expects you to compare.

The specs, in plain English

Rack tube diameterThe outside diameter of the rail your pannier hooks onto. Touring racks are often around 10mm; e-bike and cargo racks can be considerably thicker. Measure with a caliper, or by testing drill bits against the tube, before ordering a bag.
Roll-topA closure where the top of the bag is rolled down several times and clipped. Done with waterproof fabric and sealed seams it is the most reliable way to keep water out, and it lets you vary the volume by rolling more or less.
Waterproof linerA separate waterproof bag inside a tougher outer shell. The outside gets wet and the contents stay dry. Often removable, which is useful in dry weather, and replaceable when it wears out.
Welded seamA seam bonded by heat rather than stitched. Stitching makes holes; welding does not, so welded seams are what makes a liner or a bag genuinely waterproof rather than just water resistant.
Heel strikeYour heel hitting the front of the pannier as you pedal. Caused by a bag that is too long or mounted too far forward. It is annoying immediately and wears through the fabric eventually.
Cam-lock and quick-release mountsMechanisms that clamp the bag to the rack and release with a handle or lever, rather than relying on gravity and a lower hook. Worth having if you take the bag off daily or ride rough surfaces.
DenierA measure of yarn thickness in a fabric; 600D and 1000D are common. Higher numbers generally mean better abrasion resistance and more weight. It says nothing on its own about waterproofing.
Dropout hookThe lower hook or bungee that stops the bag swinging outward at the bottom. Some systems require it; others use a J-shaped hook that attaches to the rack directly and does without.
Convertible pannierA bag with shoulder straps that can be carried as a backpack. Convenient if you walk at both ends of a commute, at the cost of extra weight and hardware you carry on the bike.

Green flags vs red flags

Green flags

  • A stated rack tube diameter range, in millimetres.
  • Capacity given in litres, and dimensions published alongside it.
  • An empty weight on the page.
  • A hook size option or an oversized hook available for thicker racks.
  • A stated design measure against heel strike, such as a tapered front or a published width.

Red flags

  • No mention of rack compatibility anywhere in the listing.
  • Capacity in a unit nobody else uses, with no litre equivalent.
  • A suggested workaround that involves modifying your rack.
  • Painted steel hardware in a part that grips and gets wet.
  • No weight and no dimensions, which makes heel clearance impossible to predict.

Who's who: the brands

  • Arkel - Canadian touring specialist with a cam-lock mounting system and an oversized hook option, so its bags fit thicker rack tubing than most.
  • North St. Bags - Portland maker that publishes full dimensions and weights, offers hook size as a choice, and designs around heel clearance.
  • Two Wheel Gear - Focused on pannier-to-backpack convertibles for commuters, using the Rixen and Kaul KLICKfix rail and large laptop sleeves.
  • Banjo Brothers - Budget-focused brand that publishes its hook diameter limit plainly and builds around removable welded-seam liners.
  • Restrap - UK maker whose panniers are sold by litre capacity in small, medium and large sizes, useful as a reference point when comparing units.

How to read a listing without getting fooled

Find the mounting specification before anything else, and if the listing does not have one, treat that as the most important missing fact rather than a detail. Look for a diameter range in millimetres, or for hook size offered as a choice. Then normalise the capacity: if the number is in cubic inches, divide by about 61 to get litres, which is often a surprise. Next look for an empty weight and a set of dimensions, and hold the length and depth against your own rack and cranks to predict heel clearance. Finally work out which waterproofing approach the bag uses, because a sealed roll-top and a lined shell are different products with different failure modes, and the word waterproof gets applied to both.

How much should you spend?

Budget panniers get you a nylon shell, a removable liner and simple hooks, and they work fine on a conventional thin-tubed rack for a short commute. The mid-range is where published specifications appear, along with better shell fabrics, lighter builds and shapes designed around heel clearance. Premium buys one of two things: a fully sealed waterproof construction with welded seams and roll-top compartments for multi-day touring, or a mounting system engineered to lock on and to fit a wider range of rack tubing. Because a pannier that does not fit your rack is worth nothing at any price, treat published mounting compatibility as part of the value rather than as fine print, and remember that most of these are sold singly.

Questions, answered

Can I use one pannier on the drivetrain side?

You can, and it is usually better not to. The chain side is where grease and a derailleur live, and a bag hanging beside them picks up both. If you are running a single bag, put it on the non-drive side, which on most roads also puts it away from passing traffic.

Do panniers work on a front rack?

Some do, and size is the limit. Makers often sell a smaller version specifically for front use, because a large bag on the front affects steering far more than the same bag on the back. If a maker recommends a 24L bag for rear use and a 16L for front, that recommendation is about handling, not about space.

Will a pannier fit a rack with a wide top platform?

Not always, because the hooks need a tube to close around and a flat platform may not present one at the right spacing. Racks with a solid or very wide top deck sometimes need an adapter rail. Check the rack for a usable rail near the outer edge before you buy.

How do I stop a pannier rattling?

Most rattle comes from the lower stabiliser rather than the top hooks. Make sure the lower hook or bungee is actually engaged and tensioned, and slide the bag so the top hooks sit at the rack's stiffest point rather than mid-span. A locking mount removes most of the movement that causes noise.

Ready to choose? See our top pick, the alternatives, and the one we'd skip See the Bike Panniers verdicts

Or jump to the head-to-head: Arkel Dolphin 24L Waterproof Pannier vs North St. Bags Route Pannier 24L.

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