Blackburn Outpost Frame Bag Medium vs Topeak MidLoader 4.5L
Two frame bags, measured against each other on the figures that decide whether they work on a bike.
The short answer
The Topeak MidLoader 4.5L is ahead on capacity, weight and value per litre. Nothing measured here goes the other way.
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 5 things we can measure come out differently.
Capacity
1L more in the MidLoader 4.5LThe 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.
Weight
85g lighter on the MidLoader 4.5LEmpty weight as published. Worth holding against capacity rather than alone — the lighter bag is not the better one if it carries a third less.
Per litre
$5.53 per litre between themPrice divided by the maker's capacity. A crude measure that still catches the case where the dearer bag is also the bigger one, which the price alone hides.
Side by side
Including the rows where they are level.
| Blackburn Outpost Frame Bag Medium | Topeak MidLoader 4.5L | |
|---|---|---|
| Capacity | 3.5L | 4.5L |
| Frames it fits | 347 of 347 sizes — 100% | 347 of 347 sizes — 100% |
| Weight | 280g | 195g |
| Price | $80 | $78 |
| Per litre | $22.86 | $17.33 |