The Osprey Talon 33 is the pack I use on most hiking days. If you've read that review you'll know I rate it very highly. But there's a category of day that sits beyond what the Talon is designed for — longer multi-section routes, variable-weight days where the lid might come off for a summit push, overnight trips with minimal kit, or anything where you know 33 litres is going to feel tight before you've finished packing.
That's where the Stratos 36 earns its place.
Who the Stratos 36 is for
The Stratos 36 is one step up from a serious day pack. It's not positioned as a multi-day backpacking pack — for that you'd be looking at the Osprey Atmos or Aether range — but it has enough volume to handle a comfortable one-night wild camp with a compact sleeping system, or a very long day hike where you're carrying spare kit for genuinely changeable conditions.
I use the Talon 33 for most full-day hikes on the Jurassic Coast and Purbeck Hills. The Stratos 36 is the pack I reach for when the day gets longer or more serious — a winter traverse of the South Downs, a route across the Brecon Beacons with a bothy stop, or any trip where I want 3–5kg more packing latitude without committing to a full expedition pack.
The 3 extra litres over the Talon sounds modest. In practice, that's the difference between choosing between items and not having to. A dry bag for a sleeping bag liner, a proper set of waterproof trousers, a change of everything — the Stratos 36 swallows it without drama. The load range is rated up to 14kg, which puts it comfortably into lightweight overnight territory.
At 1.49kg the pack is heavier than the Talon (1.3kg), and that's a reasonable trade. You're not buying the Stratos 36 if weight is your priority. You're buying it because the days you need it require volume, ventilation and a more considered carrying system.
AirSpeed vs AirScape — what the difference actually means
This is the most common question people have when comparing the Stratos and the Talon. Both have ventilated back systems, but they work differently.
The Talon 33's AirScape system uses an injection-moulded foam panel that's contoured away from your back. There are ventilation channels, but the panel is relatively close to your body and the structure helps transfer load efficiently.
The Stratos 36's AirSpeed system uses a tensioned mesh trampoline — a LightWire perimeter frame that holds a mesh panel under tension, keeping it well away from your back and allowing air to move freely across the full back surface. The gap between the pack and your body is noticeably larger than on the Talon. On a hot day or a long climb, the difference is real. Your back stays drier, longer. The trade-off is load transfer. With the pack sitting further from your back, there's a slight reduction in how efficiently weight is transferred to your hips — particularly on steep terrain with a heavy load. Below 10kg you won't notice it. If you're pushing 12–14kg it's worth being aware of. For most extended day hikes and lightweight overnight use, it's not an issue.
The AirSpeed system also comes with an adjustable torso system — a 4-inch ladder adjustment on the back panel that lets you dial in the fit properly. The Talon doesn't have this. If you're between standard sizes or have a longer or shorter torso than average, the Stratos gives you a much more precise fit. On a 20km+ day that fit precision compounds into real comfort at the end of the day.
36 litres: what fits and what doesn't
A full day in late autumn on the South Downs with the Stratos 36 looks like this:
- Osprey Hydraulics 3L hydration bladder (in the reservoir sleeve)
- Waterproof jacket and trousers in a dry bag
- Mid-layer fleece in a dry bag
- Warm hat and gloves
- Spare socks
- Full day's food plus cooking kit (Fire Maple stove and gas)
- First aid kit
- Head torch and spare battery
- Phone, power bank, navigation
- Emergency bivi bag
That's a serious load for a serious day, and the Stratos 36 carries it without the main compartment feeling overstuffed. There's still room to compress things down and access the pack without needing to unload half of it to find what you're after.
For a compact overnight — a bothy or a sheltered wild camp with a lightweight sleeping bag — you'd swap the emergency bivi for the sleeping system, add a small cooking pot, and the pack fills but stays manageable. That's its upper limit for overnight use unless you're very disciplined about kit selection.
What it won't do: carry a full multi-night setup. A tent, sleeping bag, roll mat, food for three days and cooking kit will exceed what this pack was designed for. For that you'd want something in the 50–65 litre range.
Hip belt pockets and organisation
The Stratos 36 has seven external pockets. The organisation is well thought through and I'd argue slightly better structured than the Talon for extended days.
Hip belt pockets sit on both sides and are generously sized — phone, snacks, lip balm, a compact headtorch. On a long day I keep a Rab gilet compressed into one of them, which I can pull out within 30 seconds without removing the pack or opening anything. That kind of instant access matters when conditions change quickly on an exposed ridge.
Side mesh pockets are deep stretch-mesh, designed for water bottles. Access without removing the pack is possible but awkward, which is the standard issue with tall side pockets on hiking packs. It's a minor frustration rather than a design flaw.
Front stash pocket is a stretch mesh panel pocket for items you need fast — jacket, gloves, a hat. Everything that gets taken off and put back on throughout the day.
Top lid has an external pocket and an internal mesh pocket with a key clip. More on the lid in the next section, because it deserves its own.
Internal organisation: the main compartment has a full-length hydration sleeve at the back and a divider at the bottom that separates into a sleeping bag compartment when you need it. That lower compartment can be used for a sleeping bag, a bivi bag or simply as a way to keep wet gear physically separated from dry. It's a feature the Talon doesn't have, and it's quietly useful.
The pack also includes a rain cover in a bottom pocket — something the Talon doesn't come with. I still use dry bags inside regardless, but the integrated rain cover is a sensible inclusion for a pack aimed at longer, less predictable days.
The detachable lid / summit pack
This is the feature that makes the Stratos 36 more versatile than a standard day pack, and it's the one I reach for when planning routes with a significant summit push or variable-weight section.
The top lid on the Stratos 36 detaches entirely and clips together as a minimal hip pack. It's not a sophisticated lumbar pack — the capacity is small, maybe 2–3 litres — but it's enough for a summit push: phone, snacks, waterproof jacket, a first aid kit. You stash the main pack somewhere secure at the base of the climb or pass it to someone in your group, and move light for the final push.
On a Brecon Beacons day where the approach to Pen y Fan is gentle and the final ridge is technical, being able to shed 5–6kg for the upper section without reorganising into a separate bag is a practical advantage. The lid becomes its own thing. You don't need to think about it twice.
For day-only use with predictable kit, the fixed lid works fine as-is. The detachable feature doesn't add noticeable weight or bulk to the normal pack setup. It's there when you want it and invisible when you don't.
The lid also has LidLock compatibility — an Osprey attachment system for securing a bike helmet to the outside of the pack — which is useful if you're mixing hiking with cycling sections on the same day.
Hydration system
The Stratos 36 has a dedicated hydration sleeve at the back of the main compartment, accessed from inside. It fits Osprey Hydraulics reservoirs up to 3 litres. The reservoir tucks behind a fabric divider and stays out of the way of everything else you've packed, which is the same smart approach Osprey uses across their range.
The tube routes over the shoulder strap with a magnetic or clip attachment and stays in reach without breaking stride. On a long day that convenience — a drink whenever you want one, without stopping — is not a small thing. I fill the 3L bladder the night before a big hike, chill it overnight, and rarely finish it completely on a full day out. Buy the Osprey Hydraulics 3L Bladder on Amazon
When to choose the Stratos 36 over the Talon 33
Choose the Stratos 36 when:
The day is long and the weather is uncertain. When I'm covering 25km or more, carrying full wet weather gear plus a warm system, and I don't want to play Tetris in the main compartment — the extra volume settles things. I pack what I need and the pack closes cleanly.
You want better ventilation. On a hot day the AirSpeed trampoline mesh keeps your back noticeably drier than the Talon's AirScape. If you run warm, hike fast, or both — this matters more than the spec sheet suggests.
You need a detachable lid. The summit pack feature is a genuine advantage on routes with significant height gain where you want to move light for the upper section. The Talon's lid doesn't detach.
Your torso fit is non-standard. The 4-inch adjustable torso system on the Stratos gives you a precision fit the Talon can't match. If the Talon has ever felt like it's sitting slightly wrong on your back, the Stratos could solve that.
You're using trekking poles and carrying them on the pack. The Stow-on-the-Go system is present on both packs, but with 36 litres of kit secured the main body is more stable when poles are stowed and you need both hands free for a scramble section.
You're planning a lightweight overnight. The sleeping bag compartment divider, the extra volume and the detachable lid summit pack make the Stratos 36 the logical choice for compact one-night trips that the Talon 33 isn't quite built for.
When to choose the Talon 33 instead
The Stratos 36 is the better pack for longer days and variable-weight routes. But the Talon 33 is the better choice in a few specific situations.
If you're doing a well-defined full-day hike with a consistent kit list — the kind of day where you know exactly what you're carrying and 33 litres covers it — the Talon's tighter fit to your back and better load transfer give a slightly more locked-in feel. It's the more efficient mover of the two.
The Talon is also 200g lighter, which adds up over very long days at pace. If you're a fast hiker or trail runner covering serious distance and the day doesn't demand the extra volume, that weight difference matters.
And if the day genuinely doesn't warrant the Stratos — a 15km coastal path section with good weather and a predictable kit list — the Talon is the right pack. No point carrying extra structure and volume you won't use.
The two packs complement each other well. The Talon is my default for most hiking days. The Stratos is what I reach for when those days get bigger.
- AirSpeed trampoline mesh keeps your back noticeably drier than AirScape on hot or demanding days
- 4-inch adjustable torso system gives precision fit the Talon 33 can't match
- Detachable lid converts to a summit hip pack — practical on routes with significant height gain
- Sleeping bag compartment divider makes lightweight overnights viable
- 36 litres of genuine volume — enough for long days or compact one-night trips
- Integrated rain cover included (the Talon requires a separate purchase)
- Seven external pockets including well-sized hip belt pockets
- Stow-on-the-Go trekking pole attachment and ice axe loop
- Load range up to 14kg — handles a serious day's kit without stress
- Osprey All Mighty Guarantee — lifetime repair or replacement
Verdict
The Osprey Stratos 36 is the pack I want when the day demands more than the Talon 33 is built to handle. More volume, more ventilation, a better fit system and a detachable lid that pulls real work on variable-weight routes.
At ~£140 it's £10 more than the Talon 33. That difference is irrelevant when you're choosing between two fundamentally different pack categories. The Talon is the better choice for most full-day hikes where your kit list is defined and consistent. The Stratos earns its place on the days that are longer, less predictable, or need overnight capability.
I'd rate the Stratos 36 slightly below the Talon 33 overall — not because it's a lesser pack, but because the Talon's efficiency and load transfer make it a more satisfying carry on the kind of day both packs could technically handle. The Stratos is the right pack for the right day. When those days come, nothing else in the range fits the brief as well.
If you're building out a kit system and have the Talon 33 already, the Stratos 36 is the logical extension. If you're choosing your first serious pack and you know your days tend toward the longer end — or that you want overnight capability — start here.
Buy the Osprey Stratos 36 on Amazon