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British Army Military Modular Sleep System

Original price £79.99 - Original price £79.99
Original price
£79.99 - £79.99
Current price £79.99

Looking for a versatile winter sleeping bag that can handle just about any condition? Look no further than the British Army military modular sleep system. This ingenious 5 season sleeping bag features three bags in one – a Medium weight bag, a lightweight bag, and an inner liner – giving you a comfort rating of around -20°C and an extreme rating of -32°C when all combined together.

The Medium weight bag on its own is perfect for colder temperatures, while the Light bag can be used in warmer climates. Plus, the outer shell is made from ripstop nylon for extra durability, and the insulation is made from Hi-Tec to retain body warmth. So whether you're camping in the summer or braving the cold winter months, this army sleeping bag has you covered.

The Medium weight and lightweight compression sacks are sold separately due to the limited availability of the compression sacks. You can buy these from our website when they are available. 

Features Include:

  • British Army Issue military modular sleeping system
  • On its own the Medium weight bag is a great 3 season bag
  • Lightweight bag has in-built insect net
  • Inner mesh pockets for valuables 
  • Outer shell is ripstop nylon
  • Insulation: Hi-Tec  to retain body warmth
  • Comfort rating of around -20 °C
  • Extreme rating -32 °C
  • Size Large: 210 x 81cm 
  • Size Medium: 205 x 76cm
  • Weight Medium: Approx. 4kg
  • Weight Large: Approx. 4.5kg
  • Pack size for Medium weight bag approx: 40cm x 30cm 
  • Pack size for lightweight bag approx: 30 x 20cm 
  • Compression sacks sold separately ( Can be purchased from the website when available)
  • Grade 1 used condition

Check out more of our winter sleeping bag here at GoArmy today.

Youtube Review:

United Kingdom 

Under 2kg:
Standard Delivery (2-4 days) - £3.50
Express Delivery (1-2 days) - £4.50
Next Day - £4.99

Over 2kg:
Next Day - £4.99

Saturday Delivery:
Saturday Delivery - £6.99
Saturday Before 1pm - £9.99

Rest of the world
UPS or Fed-Ex - Calculated on checkout 

Next Day Delivery
Orders must be made before 1pm for next day delivery.
Orders made after 1pm on Thursday will arrive on Monday (unless Saturday delivery chosen)
Orders made after 1pm on Friday will be shipped on Monday. 

For more information on shipping please see our shipping policy HERE


To obtain a return label if you live on the UK mainland please CLICK HERE. If you are unable to generate a returns label please email us at Please check your spam folder for replies from us. 

If returning an item for a refund we charge £3 for the return label which is taken from the refund amount. 

If you want to exchange your order please send the item/items back for a refund and make a new order for the items you would like

We accept returns / exchanges from 30 days of the order date. Items must be in original condition to be accepted for returns. A refund is given within 1-2 days of receiving the returned item. 

International order must arrange thier own return postage which is non-refundable. 

Mailing Bags

  • Small items - Paper mailing bags
  • Larger items - Biodegradable sugarcane bags 
  • Very large items - Cardboard boxes

Packing Tape

  • Small items - Gum tape / Kraft Tape (biodegradable)
  • Larger items - Kraft Tape (biodegradable)

If you buy any of our army surplus products then all the packaging will be plastic free. With army surplus you minimise the environmental impact of producing new clothes and reduce plastic waste. 

With our new items there may be plastic packing which comes from the supplier themselves. 

Although we are not totally plastic free (but pretty close) our goal is to reduce our plastic waste as much as possible and will continue to do so going into the future.

Customer Reviews

Based on 50 reviews

A great bit of kit and at a fantastic price, delivered promptly too. Will hopefully provide many years of reliable use.

5 stars for customer service!

My stars here go for customer service as well as the product I finally received. I ordered the Modular sleep system and, to be honest, both bags were clearly USED! To be specific, the lightweight bag had some frayed stitching etc but could be passable as grade 1, so not too bad. However, the medium weight bag had a small rip/hole, the panel which covers the zip had ripped away (causing the hole I think), and I reckon the bag had been washed a 100 times...
That said, I emailed Go Army explaining the issues, and they were great. Without hesitation, they gave me a free replacement medium bag which also came really quickly. I haven`t seen it with my own eyes yet as I live in Japan and we agreed it could be sent to my parents` house in the UK for me to collect at Christmas, but I`ve seen it on video chat and it appears to be in SuperGrade/Unused condition. They even let me keep the first one, which I`ve repaired and will keep as a spare, or donate it to someone who needs it more than me. I`m really happy with the way GoArmy responded in this instance.

Modular Sleep System

Arrived Quickly. Well Packaged. All the components of the Sleep System were like new. Absolutely nothing wrong with any part. Would DEFINITELY RECOMMEND the seller, and the Sleep System. Great bit of kit! 5☆ 10/10

Glyn W
Great bag and system

Great bag and system.Great delivery and quality gear.

David Smith
British Army Military Modular Sleep System.

This as epected is an excellent piece of equipmet, very well packaged for delivery and arrived sooner than expected, Great job GoArmy