Topeak BackLoader 15L 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 BackLoader 15L takes weight; the BackLoader X 15L takes how far it reaches back and tire clearance. The biggest single gap is 16cm shorter on the BackLoader X 15L. 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
3 of the 6 things we can measure come out differently.
Reach behind the saddle
16cm shorter on the BackLoader X 15LLength 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 BackLoader X 15LDepth 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
40g lighter on the BackLoader 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.
Side by side
Including the rows where they are level.
| Topeak BackLoader 15L | Topeak BackLoader X 15L | |
|---|---|---|
| Capacity | 15L | 15L |
| Reach behind the saddle | 67cm | 51cm |
| Depth | 28cm | 24cm |
| Weight | 565g | 605g |
| Price | $123 | $130 |
| Per litre | $8.20 | $8.67 |
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