AirDesign Trail Rucksack 24L vs 38L: the decision in brief
The 24L and 38L are not two sizes of the same bag — they are two different carrying formats built around different priorities. The AirDesign Hike & Fly Trail Rucksack 24L is documented with a foldable top closing and a detachable helmet mesh. The current AirDesign Hike & Fly Trail Rucksack 38L page documents long-zipper access to the main compartment, a hidden helmet net, shoulder-strap accessory pockets and an internal flask compartment. Neither the litre figure nor the external dimensions on either product page confirm that your specific packed wing, harness and helmet will fit — that's something only you can measure and check.
Published capacity, dimensions and qualified mass compared
According to the current AirDesign 24L product page and the AirDesign 38L product page, both checked on 28 September 2026, the published figures are:
| Spec | 24L | 38L |
|---|---|---|
| Nominal capacity | 24 litres | 38 litres |
| Dimensions (axes unlabelled by manufacturer) | 30cm x 15cm x 50cm | 28x22x60cm |
| Published mass | From 410g to 450g with helmet mesh | 785g (± 5g) |
Neither page labels which figure is width, height or depth, so it isn't accurate to assume an axis order that isn't stated. The 24L's weight is published as a range that explicitly includes its helmet mesh; the source doesn't give a separate bare-pack figure or an isolated mesh weight, so it's best kept as that range rather than split apart.
Pockets, helmet storage and carrying features
The 24L is documented with an ergonomic jacket-style carrying system, a balanced strap connection described by the manufacturer as improving stability, multiple mesh or zipped pockets, compression straps, pole connection loops, and a detachable helmet mesh.
The 38L is documented with vertical pack distribution positioned close to the back, large trail-type shoulder and chest straps described by the manufacturer as reducing pressure and improving comfort, accessory pockets for a phone or water flask built into the shoulder straps, shoulder straps adjustable in both angle and height, a hidden helmet net, an internal water-flask compartment with a hydration-pipe outlet, and a multiple functional pocket system. These comfort and stability descriptions are the manufacturer's own wording rather than results from independent testing.
Main-compartment access and closure differences
This is one of the clearest documented differences between the two. The 24L closes with a foldable top closing. The 38L is built around long zippers that the manufacturer describes as giving easy access to the large glider compartment. Beyond naming these two closure and access mechanisms, the product pages don't specify which packing habits or hiking styles each is suited to — that's worth weighing against how you personally like to reach and repack your own kit.
Water-repellent fabric and watertight zippers: what the wording establishes
Both packs use similar language: the 24L page states ‘Robust ripstop material’ and ‘Water repellent fabric with water tight zippers’; the 38L page states ‘Water-repellent material with watertight zippers’ and ‘Robust ripstop fabric’. This wording describes the fabric and the zippers used, not a rating for the finished, assembled pack. It doesn't establish that either complete rucksack is waterproof, weatherproof or submersible.
Editorial buying checklist: measure packed kit, assess access needs and verify carrying fit
- Measure your own packed wing, harness and helmet as you actually fold and stuff them — not the manufacturer's own kit examples — and compare those measurements against the pack's stated dimensions, keeping in mind the axes aren't labelled.
- Decide how you want to reach your glider: the 24L closes with a foldable top, while the 38L uses long zippers to access the main compartment — consider which closure and access style suits how you pack and unpack your kit.
- Check where you want your helmet carried and whether a detachable mesh (24L) or a hidden net (38L) matches how you like to secure it.
- The 38L page specifically locates accessory pockets for a phone or water flask on the shoulder straps. The 24L page lists multiple mesh or zipped pockets without specifying their location.
- Before buying, verify carrying fit and comfort for your own body and load with the seller directly, since strap comfort and balance are described by the manufacturer and haven't been independently tested by Altura.
Compare the two current Altura product pages
Once you've measured your own packed kit against these published figures, you can look at both listings side by side, and the wider Altura shop if you're weighing up other hike & fly carrying options at the same time.