Professional 3-4 Season Mummy Sleeping Bag (300 GSM)

5.00 out of 5

Professional 3-4 Season Mummy Sleeping Bag (300 GSM)

5.00 out of 5

£27.99 £22.99

  • Ultra Warm Filling: 300GSM (2 x 150g/m2).Water Resistant and Perfect for 3-4 Seasons
  • Comfort Temperature: of +10°C to 0°C. Extreme use down to -10°C
  • All Body Coverage: Drawstring mummy hood covers your entire head and face to keep warm
  • Internal Storage Pouch: for valuables and mobile phones, wind-proof double zipper system and internal drawstring collar for ultimate comfort
  • Comfortable, Durable & Lightweight: for Summer and Winter camping, outdoor use. Compression bag for easy carrying included

20 in stock

Product Information

This premium quality, 3-4 season sleeping bag from Active Era is made from a durable 190T polyester outer shell, with an ultra-warm 300GSM double filling for use in temperatures from 0°C to 10°C and extreme temperatures down to minus 10 degrees Celsius. Both the compression bag and sleeping bag’s outer shell are water resistant in damp environments, and it is fully machine washable too.

Instead of a single 300GSM filling, this professional sleeping bag is packed with a double layer containing 2 x 150g/m² hollow fibre layers, and a drawstring hood. This provides a considerable increase in insulation and warmth compared to a regular single layered 300GSM sleeping bag, and ideal for use outside in both winter and summer.

Key Features

  • 300GSM (2 x 150g/m²) ultra-warm filling.
  • 190T Polyester durable outer shell – Water resistant against damp.
  • Fully Machine Washable.
  • Double zipper system with windproof draft tube lining for extra insulation.
  • Secure internal pouch for valuables (mobile phones, electronics, accessories).
  • Additional internal drawstring collar pulls above the shoulders to keep out unwanted drafts and wind.


Free Next Day Delivery:

All orders sent within the United Kingdom come with FREE NEXT DAY DELIVERY.

  • Next Day Delivery is available if you order before 2 pm Monday to Thursday.
  • If you place your order after 2 pm on Thursday your item(s) will be delivered on Monday.
  • If you place your order after 2 pm on Friday your item(s) will be delivered on Tuesday.

Your order will be delivered via DPD. You will receive an SMS & Email highlighting your allocated 1 hour delivery slot.

Follow the link within the Email or SMS to action the following changes to your delivery:

  • Change your delivery day
  • Leave your item in a safe place
  • Deliver your item to a neighbour

For further information & Steps to Return your item please visit our Delivery, Returns & Refunds Page


We really hope you like your purchase from Active Era however in the event you do wish to make a return, we offer a 30-day money-back guarantee for your peace of mind. For further information & the steps to return your item please visit our Returns Page.

Our Returns Address:

WWL Pro Breeze Returns
Unit 16 Thames Gateway Park
Chequers Lane


When will I receive my Refund?

Following a successful inspection of your return we will process a refund to the credit / debit card or PayPal account which was used to place the original order.

Please allow 5 working days for the refund to appear in your account.

For further information about our refund policy item please visit our Delivery, Returns & Refunds Page


All Active Era products come with a 12-month warranty that is valid from the date of purchase. For further information please visit our Warranty Page.


Model SB-M300
Dimensions (LxWxH) (cm) 220 x 80 x 55
Type Mummy
Net Weight 1.5
Filling GSM 300
Water Resistant Yes
Seasons 3/4
Comfort Temperature Range 10˚C
Limit of Comfort Temperature Range 0˚C
Extreme Temperature Range -10˚C
Drawstring Hood Yes
Internal Pocket Yes
Wind-Proof Zipper Yes
Insulation Tube Yes
Compression Straps Yes
Ripstop No
Material Shell 190T Polyester Waterproof
Material Liner 190T polyester
Material Filling 150GSM*2 Polyester
EAN 5060596020580

Reviews (8)
5.00 out of 5

8 reviews for Professional 3-4 Season Mummy Sleeping Bag (300 GSM)

  1. Gemma Porter

    5 out of 5

    Bought this for a D of E expedition for one of my twins.

    Twin 1 had my old expensive sleeping bag and twin 2 had this. Twin 1 was cold overnight and twin 2 wasn’t! That’s a pretty good micro survey in controlled conditions. This one didn’t fold up as small and was heavier but still a great buy for the price. Longer than my other bag too. It was around 9 degrees overnight so is fine for camping in the warmer months.

  2. Phoebe Bent

    5 out of 5

    The sleeping bag does exactly what it should but the main reason for my review is the fantastic customer service I had from this company

    After buying it on my first Camping trip with this sleeping bag the zipper snagged. It became jammed. Rather than write anything negative (give companies a chance!) I contacted them.

    Without even any hesitation they sent me a new one which arrived today. 5 star service from a small company. You wouldn’t get this from a similar company producing £100+ similar products!

  3. Daniel Potter

    5 out of 5

    Just come back from a hiking trip to the Atlas mountains where I used this sleeping bag. While it is large and warm it is also pretty light and compresses to a small size, comfortably fitting in a large rucksack.

    I had hoped to try it out in very cold conditions during my hike but alas – the weather was too warm, and I had more of a problem being too hot. However, there is a zipper at second zipper at the bottom by your feet meaning it is easy to let in some air if you get too hot.

    There is a small pouch for phones or valuables but this is positioned right at the top, in front of your face (depending on how you sleep), and I didn’t find it very useful.

  4. Andy Brodin

    5 out of 5

    Nice and light to carry. Fell asleep outside the tent staring at the summer stars about 2500ft up in the Cairngorms in July. Temp was about 2 degrees. Nose was bit cold but the rest of me was toasty and warm. Would have slept longer if it wasn’t so light. Reckon this will be fine for spring summer and autumn but I’ll stick to my artic bag for the winter..

  5. Carlos Andres Cerda Veloz

    5 out of 5

    I used the bag during a festival during 3 long nights with fast winds and constant raining, the tent was freezing but the sleeping bag did its work. It keep warm during the nights. Only thing that can be improved is the pockets positions, they are in an awkward location, maybe they will be more useful in the middle area of the bag

  6. Milly Ann

    5 out of 5

    It’s absolutely fantastic. Keeps me very cosy and warm. I love the two way zip as if I get warm I can put my feet out of the end to cool down.
    Thankyou very much

  7. Karen Baxter

    5 out of 5

    Bought for my teenage daughter for her trip to Zambia.

    Used indoors and outdoors. Temperature dropped to between 5-10 degrees at night but she was always warm in the sleeping bag.
    Quick delivery. Highly recommend.

  8. Pippa Dawson

    5 out of 5

    Daughters have both used it for Bronze DoE in Summer time (ie not too onerous!) – and Daughter Number 2 has just finished Gold – Brecon Beacons in March and Lake District in July – its not too heavy and kept them warm on all occasions. Also ideal for teenage party sleepovers too. Seems to wash well too as long as you treat it carefully. Zip needs to be treated carefully. A great value purchase and have just ordered a second as they both need one each now.

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Product Comparison

Dimensions (LxWxH) (cm)
Filling GSM
Comfort Temperature Range
Limit of Comfort Temperature Range

Professional 3-4 Season Mummy Sleeping Bag (300 GSM)

220 x 80 x 55
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Premium Lightweight Mummy Sleeping Bag (150 GSM)

210 x 80 x 50
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Premium Warm Lightweight Envelope Sleeping Bag (200 GSM)

186 x 75
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