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Seral 4 Black
Bike bum bag - Unisex - Seral 4 - Osprey
Home delivery from 24/07/2026
60 days to change your mind
No subject to promotional offersThe Seral 4 Black is a unisex bicycle lumbar bag from Osprey.
Designed for road and trail cycling, it features a ventilated and comfortable AirScape™ back panel. Its mesh waistband also ensures a precise fit and an ideal, adjustable fit for cycling, even at high intensities.
Supplied with a 1.5-litre Hydraulics™ tank, it also has 4 litres of space so you can carry everything you need for your outing. The two separate compartments will keep you organised by separating your cycling tools from your favourite snacks, for example.
There's also a flashing light attachment point and a reflective strip to keep you safe even when you're out and about at night.
Weight: 420 grams
Dimensions: 19*32*11.5 cm.
Volume: 4 litres.
Materials:
- Main material: Recycled and BlueSign® approved 600D PET , PFAS free water repellent treatment.
Base of bag: High-tenacity recycled nylon 400D BlueSign® approved with a PFAS free water resistant treatment.
Features:
- AirScape Back panel with lumbar support for maximum stability.
- Large zipped main compartment with tank pocket.
- Osprey Hydraulics™ 1.5 L Lumbar reservoir included with strong magnetic attachment point for hydration valve on belt.
- Easy-access front zipped pocket with internal tool storage.
- Fixing point for flashing light with reflective pattern.
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