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The Osprey Seral 4 Pack is a hydration pack that won’t touch your shoulders. A lumbar pack that’s specifically for hydration, it includes and holds a 1.5L bladder for keeping the water flowing while on the mountain bike. The drink tube features magnetic connection, which stays in place but is easily grabbed when it’s time to hydrate. Add in a few essentials such as a spare bike tube, pump or snacks and pedal away.

FEATURES of the Osprey Seral 4 Pack
- Lumbar-style bike pack with integrated 1.5L reservoir and a minimal body contact and volume for quick rides
- AirScape back panel with contouring lumbar wrap provides maximum stability
- Included Osprey Hydraulics 1.5 L lumbar reservoir by Hydrapak
- Magnetic hipbelt bite valve attachment
- Large zippered main compartment with reservoir sleeve
- Main compartment tool organization and internal zippered pocket
- Blinker light attachment with reflective graphic
- Extra thick ridged foam with center air channel for excellent ventilation
- Airmesh wrap hipbelt with zippered fabric pockets provide stability and breathability
- ErgoPull waist strap closure system allows for proper snug and stable fit
Fabric Details
- Recycled 600D PET polyester, PFC-free DWR
Osprey Men’s Backpacks
| PACK SIZE | One Size | Small | Small / Medium | Medium | Medium / Large | Large | Large / X-Large |
| Aether, Aether Plus | – | – | 17 – 21″ | – | – | – | 19 – 23″ |
| Aether Pro | – | 16 – 19″ | – | 18 – 21″ | – | 20 – 23″ | – |
| Archeon 30 | 17 – 22″ | – | – | – | – | – | – |
| Archeon 45 | – | – | 17 – 21″ | – | – | – | 19 – 23″ |
| Atmos AG | – | 16 – 19″ | – | 18 – 21″ | – | 20 – 23″ | – |
| Atmos 65 | – | – | 17 – 21″ | – | – | – | 19 – 23″ |
| Exos | – | 16 – 19″ | – | 18 – 21″ | – | 20 – 23″ | – |
| Kamber 16 | 18 – 22″ | – | – | – | – | – | – |
| Kamber 22, 32, and 42 | – | – | 16 – 20″ | – | 19 – 23″ | – | – |
| Kestrel | – | – | 16 – 20″ | – | 19 – 23″ | – | – |
| Levity | – | 16 – 19″ | – | 18 – 21″ | – | 20 – 23″ | – |
| Rook | 17 – 22″ | – | – | – | – | – | – |
| Soelden, Soelden Pro | 17 – 22″ | – | – | – | – | – | – |
| Stratos | – | – | 16 – 20″ | – | 19 – 23″ | – | – |
| Talon, Talon Pro | – | – | 17 – 20″ | – | – | – | 19 – 22″ |
Osprey Men’s Hydration Packs
| PACK SIZE | One Size | Small / Medium | Medium / Large |
| Duro | – | 33 – 39″ Chest Measurement | 37 – 44″ Chest Measurement |
| Katari | 17 – 21″ | – | – |
| Manta | 17 – 22″ | – | – |
| Raptor | 17 – 21″ | – | – |
| Skarab | 17 – 22″ | – | – |
| Siskin | 17 – 21″ | – | – |
| Syncro | 17 – 21″ | – | – |
Osprey Men’s Travel Packs
| PACK SIZE | One Size | Small / Medium | Medium / Large |
| Farpoint Travel Pack | – | 15 – 19″ | 18 – 22″ |
| Farpoint Trek | 17 – 22″ | – | – |
| Ozone Duplex | 17 – 22″ | – | – |
Please note that the info provided above refers to the Torso Size / Length the pack will fit, and NOT any dimensions of the pack. Below are steps for how to measure your torso length. You should have someone help take this measurement for you so it is accurate.
HOW to MEASURE TORSO LENGTH:
1. Start at the iliac crest, which is the top of the hipbones on the side of your body. These act like a shelf for supporting a pack hipbelt.
2. Touch your chin to your chest to find the C7 vertebrae, the knobby bone at the base of your neck.
3. Make sure you keep your back as straight as possible while measuring.
4. Measure the full length from the C7 vertebrae to the iliac crest. This torso measurement determines what size Osprey pack you should carry. Refer to the size chart above to find your ideal size.
5. If you are in between sizes, it is ideal to try them both on before ordering.
HOW to MEASURE CHEST MEASUREMENT:
Measure around the fullest part of the chest.
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