Ortlieb Saddle-Bag Two 4.1L vs Ortlieb Seat-Pack QR 7.5L
Two seat packs, measured against each other on the figures that decide whether they work on a bike.
The short answer
The Saddle-Bag Two 4.1L takes how far it reaches back, tire clearance, weight and price; the Seat-Pack QR 7.5L takes capacity. The biggest single gap is $85 between them. Which of those you care about depends on the frame you are fitting it to.
Assembled from the differences below rather than written over them. Every figure is a published measurement or computed from one — nobody here has used either one.
Where they differ
5 of the 6 things we can measure come out differently.
Capacity
3.4L more in the Seat-Pack QR 7.5LThe maker's own figure. Worth reading alongside the dimensions below rather than on its own — two bags of the same litreage can want very different frames.
Reach behind the saddle
18cm shorter on the Saddle-Bag Two 4.1LLength is the lever arm on the seatpost, and the longer lever is what makes a loaded pack sway. Shorter is easier to live with; longer usually means more volume. It is a trade, not a fault.
Depth
4cm shallower on the Saddle-Bag Two 4.1LDepth is what competes with the rear tire once the pack sags under load. On a small frame or a big tire this is the measurement that decides it.
Weight
200g lighter on the Saddle-Bag Two 4.1LEmpty weight as published. Worth holding against capacity rather than alone — the lighter bag is not the better one if it carries a third less.
Price
$85 between themManufacturer's price as we hold it.
Side by side
Including the rows where they are level.
| Ortlieb Saddle-Bag Two 4.1L | Ortlieb Seat-Pack QR 7.5L | |
|---|---|---|
| Capacity | 4.1L | 7.5L |
| Reach behind the saddle | 24cm | 42cm |
| Depth | 12cm | 16cm |
| Weight | 290g | 490g |
| Price | $85 | $170 |
| Per litre | $20.73 | $22.67 |
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