Osprey Seral

Comfy, padded fitting. Surprising space. 1.5L bladder.

Bum bag. Hip pack. Lumbar bag. Fanny pack. Enduro belt. Whatever you want to call it, the Osprey Seral 7 is one of those. It’s a bag with a waist belt and no shoulder straps. It’s minimal but not small. It’s a sort of a halfway house between strapping things to your bike and carrying a full rucksack.

Being honest, I wanted to hate this before it arrived. Those of you who know me, or who have read reviews from me in the past, will know that I’m a huge advocate of riding without a pack… so I’m probably the last person expected to be telling you how good the Osprey Seral 7 is. And it is. It’s now my go to.

The bag itself is designed with wide, padded straps for around the waist. When fastened, they sit comfortably on the waist and don’t have to be pulled excruciatingly tight to keep the bag in place. The width of them makes them large enough to store an energy bar, a multi tool or a glasses in the side pocket.

Holding a 1.5 litre bladder is impressive since the bag seems too small to allow that much water to be carried. Put simply, it’s deceptive how much you can fit inside the bag. Even when the bladder is full there’s still plenty of room. I’ve managed to pack a DSLR and small lens along with a full bladder, keys, emergency whistle, phone, spare batteries and two energy bars. And the bag still sat on the waist… even when I tried to rattle it about whilst getting a little air.

The bag and bladder are both the same Osprey quality as expected. The construction seems very hard wearing and tough being made from a durable material. The bladder is well designed to fill in three sections, allowing it to mould to the shape of your lower back and bend with the shape of the bag. The hose from the bladder has the typical bite valve on the end and magnetic clip to keep it secure when not in use. The only gripe I have with the whole design is the lack of bite valve cover to keep dirt getting on it when resting the pack on the floor; but I can overlook that for the comfort the bag provides.

View the Osprey Seral 7 here.

Further Info

Osprey have included some small but clever design choices which might seem insignificant but do make a difference, to me at least. At the top of the bag, in the middle, is a small loop which acts as a handle when lifting the pack. When fastening, I use this loop to ensure the bag is in the right place on my back.

Inside the bag there are two pockets – one where the bladder is located, and one at the front of the bag. To me, this really matters since I can fill the bladder in the morning, throw it in the bag and not worry about any water I splashed on the outside working its wonders on my phone or GoPro. Instead, I put any electronics in the very front pocket knowing they’re well away from any water.

The mesh pocket inside the bag is perfectly sized for two energy bars and also has a loop on the outside. I’ve clipped a mini-carabiner to this so that I can attach an emergency whistle (just in case!). There’s also a key clip to stop your car keys from going wandering whilst riding.

All in all, I’m a bit of a bum bag convert; which is something I never thought I’d say. It’s a freeing feeling having nothing on your shoulders whilst riding but the Osprey Seral 7 means I have everything I need stored securely and comfortably.

I guess I’m no longer a ‘packless’ rider.


  • 1.5L Hydraulics™ Lumbar Reservoir included
  • 180 degree on/off bite valve
  • AirScape™ backpanel with foam ridges for comfort and fit
  • Bite Valve offers fast, smooth water delivery
  • Front zippered pocket
  • Internal hydration sleeve
  • Internal key attachment clip
  • Internal mesh side pocket
  • Internal organisation pocket
  • LED light attachment point
  • Reflective graphics
  • Side compression straps
  • Twin zippered hip belt pockets
  • Zippered scratch-free sunglasses and electronics pocket.

Follow them on social media here:
Instagram: @OspreyEurope
Twitter: @OspreyEurope
Facebook: /OspreyEurope
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YouTube: Osprey Europe



Review written by: Lewis – #TotalMTB Photography and Videography
Instagram: @Pedal_Slip
Twitter: @PedalSlip
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