Revelate Designs Spinelock 16 Seat Bag vs Topeak BackLoader X 15L
Two seat packs, measured against each other on the figures that decide whether they work on a bike.
The short answer
The Spinelock 16 Seat Bag takes capacity and tire clearance; the BackLoader X 15L takes weight and price. The biggest single gap is $40 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
4 of the 6 things we can measure come out differently.
Capacity
1L more in the Spinelock 16 Seat BagThe 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.
Depth
2cm shallower on the Spinelock 16 Seat BagDepth 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
75g lighter on the BackLoader X 15LEmpty 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
$40 between themManufacturer's price as we hold it.
Side by side
Including the rows where they are level.
| Revelate Designs Spinelock 16 Seat Bag | Topeak BackLoader X 15L | |
|---|---|---|
| Capacity | 16L | 15L |
| Reach behind the saddle | 50cm | 51cm |
| Depth | 22cm | 24cm |
| Weight | 680g | 605g |
| Price | $170 | $130 |
| Per litre | $10.63 | $8.67 |
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