OMM Classic Marathon 25 Backpack Black & Yellow

OMM Classic Marathon 25 Backpack Black & Yellow




A truly Classic pack, used around the world for Mountain Marathons, Extreme Races, Ultra’s, Biking, Hiking, skiing and many other activities – including ascents to the summit of Everest! The simple, effective design has never been bettered, this is the standard by which all others are benchmarked.


  • LeanWeight Chassis
  • UGR – Universal Gear Rail
  • EVA padded shoulder harness
  • Speed opening buckle system for single handed closure and swift access.
  • Reflective detailing
  • Zipped top pocket + quick stash top mesh sleeve pocket
  • Two zipped belt pockets
  • Stretch mesh bottle pockets for on the move accessibility
  • Adjustable chest strap with integrated whistle
  • Leanweight MSC Compatible
  • Adjustable chest strap with integrated whistle
  • Security Key Clip in top and waist pockets
  • Removable back padding to achieve Leanweight
  • Duomat works as either a sleepmat or sitpad
  • Hydration bladder compatible
  • Hydration bladder tube can be routed over or under shoulder
  • OTMA (On the Move Accessibility)
  • Link System compatible – OMM I Gamy and Chest Pouches
  • Active Fit


  • Full Weigh:t 670g
  • LeanWeight: 540g
  • Capacity: 25 litres
  • Back Padding: Duomat (removable)
  • Pockets: 2 zip Belt, 2 Mesh side, 1 Mesh Front, 2 Flap
  • Compression: Yes, customisable using tabs and hooks on pack plus addition of Leanweight Compression Kit, also full intergrated Front mesh Compression
  • Back Length: 45cm
  • Fabrics: 210T / HTTF

Customer Reviews

"Amazing backpack the best on the market" Review by
It is the best backpack I have and I have several. Every time I buy a product OMM surprised me how well they are made. This is a backpack that surprises the ability. It is very comfortable to wear and does not bother to run, is perfect for racing Ultra, Marathon, etc weighs very little and is very well designed. I am very happy with this purchase. Thank you so much OMM.

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"Review of OMM Classic Marathon 25" Review by
It's perfect, comfortable, easy to carry and fits the body very well. Also bring a small mat. It is the best in the market without any doubt. Just be wanting a variety of colors so other wider is perfect. All product OMM are the best quality-price on the market.

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Delivery and Returns


SPRINT Next working day FREE on orders over £100
(£6 for orders up to £100)
RUN 2-3 working days FREE on orders over £50
(£3 for orders up to £50)
Royal Mail
CLICK & COLLECT (Glasgow) 1-2 Working days FREE  
SATURDAY DELIVERY 1 working day £12 Royal Mail

Orders received before 2pm (Monday-Friday) are processed on the same day - after 2pm orders will be processed on the next working day.

Click & Collect

Collect your order in person from the achilles heel Glasgow running shop. Orders placed before 2pm will be available for collection on the next working day; orders placed after 2pm will be available for collection in 2 working days. Orders placed over the weekend will be available for collection on the Tuesday.

As soon as your order is ready for collection we will email to let you know. When you collect your order please ensure you bring your order confirmation & identification.

International Delivery

We'll package and post your order to most locations across the world as quickly as we can - for full details of delivery charges for international orders check our delivery charges page.

Spend £200+ and get FREE EU delivery.


At achilles heel we aim to please, so if you're not completely satisfied with your order, we'll do whatever we can to make it better. Items can be returned for free for an exchange or a refund within 28 days of purchase - we offer free & easy tracked returns via Royal Mail, for full details please check our returns page.


It can be hard to get things right so we are giving 28 days from Christmas Day to return your gifts on all orders made during November and December. Our returns policy will revert to the standard 28-day period for items purchased after December 31st.

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