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Description
Deepsleep -5C / 20F Left ZipThe DeepSleep 20F sleeping bag is a compact and feature rich all season sleeping bag ideal for colder conditions. DeepSleep strikes the perfect balance between performance and value with features commonly found in more premium sleeping bags, such as 100% recycled polyester that performs well even in damp conditions, a 3D foot box with a compartment for clothes or a heated water bottle, and an included compression stuff sack. Eco friendliness is also a
The DeepSleep 20°F sleeping bag is a compact and feature rich all-season sleeping bag ideal for colder conditions. DeepSleep strikes the perfect balance between performance and value with features commonly found in more premium sleeping bags, such as 100% recycled polyester that performs well even in damp conditions, a 3D foot box with a compartment for clothes or a heated water bottle, and an included compression stuff sack. Eco-friendliness is also a driving factor behind this bag. The DeepSleep sleeping bag line is designed using monomaterials, meaning the whole bag—from the outer shell to the inner liner—is made from the same material, thus making the product easier to recycle, reducing waste, and conserving resources.
- Recycled monomaterial: Made entirely from 100% recycled polyester, making all materials & components easier to recycle and repurpose at end-of-life
- Synthetic insulation: High-performance synthetic filling insulates well even in damp conditions
- Adjustable hood & draft collar: Adjustable drawstring hood & draft collar reduce heat loss and keep you warm at night
- Footbox compartment: 3D footbox with compartment for hand warmers, clothing, or a heated water bottle keeps feet warm
- Convenient chest pocket: Internal chest pocket for keeps small items like your phone or a headlamp close-by
- Compression stuff sack: Included compression stuff sack cinches vertically to reduce packed size while out on a trip (not meant for long-term storage)
- Shape: Mummy
- Zipper Orientation: Left Zip
- Comfort Temp: 0°C/32°F
- Limit Temp: -6°C/21°F
- Extreme Temp: -24°C/-11°F
- Weight: (S): 61.7 oz / 3 lbs 14 oz, (M): 64.6 oz / 4 lbs 1 oz (MW): 67.0 oz / 4 lbs 3 oz, (L): 68.9 oz / 4 lbs 5 oz, (LW): 70.5 oz / 4 lbs 7 oz
- Inner Girth (Shoulder): (S): 58.3 in, (M): 58.3 in, (MW): 59.4 in, (L): 64.2 in, (LW): 65.4 in
- Inner Girth (Foot): (S): 37.8 in, (M): 37.8 in, (MW): 39 in, (L): 39 in, (LW): 39 in
- Sleeping Bag Length: (S): 76.8 in, (M): 79.9 in, (MW): 79.9 in, (L): 85.8 in, (LW): 85.8 in
- Fits up to body size: (S): 66.9 in / 5' 7", (M): 70.9 in / 5' 11", (MW): 70.9 in / 5' 11", (L): 76.8 in / 6' 5", (LW): 76.8 in / 6' 5"
- Packed Volume: 12 L
- Includes: Sleeping bag, compression stuff sack, sling storage bag
- Shell Fabric: Recycled 40 D ripstop polyester, OEKO-TEX 100 certified, PFAS free
- Liner: Recycled 40 D ripstop polyester, OEKO-TEX 100 certified, DWR free, PFAS free
- Fill: 100% recycled Texpedloft polyester, bluesign approved, PFAS free
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4.4 ★★★★★
Based on 13 reviews
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Product Reviews
★★★★★ 5
Very good!
Format: Paperback
Book worth gold I love it! I will read it again! I recommend you buy it! Open your mind and make finances 🧠✨️
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Reviewed in the United States on April 1, 2026
★★★★★ 4
8.5 de 10
Format: Kindle
Lenguaje solo para profesionales y no para principiantes. Lo demás es perfecto con 4 estrellas ya que hasta lloré 3 veces ...
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Reviewed in the United States on April 22, 2026
★★★★★ 5
Interesting
Format: Paperback
Product with very good quality, its description matches the website.
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Reviewed in the United States on April 11, 2026
★★★★★ 5
A wonderful primer for those discovering the amazing world of generative AI
Format: Paperback, Format: Paperback
Somewhere in the past year, ChatGPT has gone from "cool, interesting, amusing" to a massively valuable work assistant capable of writing Python scripts, analysing data, and doing lots, lots, more. The key to this? The rapid evolution of OpenAI's GPT models and making my first forays into prompt engineering.
If I thought I was getting good, though, this book took me reminded me that I'm just scratching the surface. Halfway through the first chapter I was already furiously scribbling notes in the margins for what I could do better with my prompt writing and by the end of the text I felt like I had gotten a very good grounding - not just in GPTs specifically but in the bigger picture of how these hugely powerful tools were trained and came to maturity.
I imagine that few will argue with my assertion that there is lots of hyperbole and "noise" in the AI space right now which, as ever, makes it hard to pick out the signal from the noise. Which is precisely why I sought out an O'Reilly title and I'm very glad that I did.
Thorough, excellent, and I hope that this edition will be the first of many. As this rapidly maturing field scales and matures I think that prompt engineering will be an essential discipline to master. Pick up this text to get a good foothold on things.
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Reviewed in the United States on August 3, 2024
★★★★★ 4
Understanding AI prompts as a science
Format: Audiobook
Prompt engineering is the art and science of finding the right words to generate the right responses from artificial intelligence (AI). It's becoming a skill in-demand in today's workplaces. It's also becoming an essential skill for life. To understand prompt engineering, you must understand how AI tools understand their inputs. This book explains that to you in many forms.
It covers prompting as it intersects all the major AI disciplines, like general prompts (as in a ChatBot), fine-tuning, and retrieval-augmented generation (RAG). It also introduces how prompting intersects a couple of image-generation tools.
As a scientist, I appreciate the theoretical approach to these practical matters. Too many people are hacks at AI these days, and any technical understanding can rapidly advance an individual's effectiveness. Prompt engineering is often made fun of as a "soft" topic, but as this book demonstrates, it intersects all the major AI areas. Presumably less garbage in means less garbage out. This book shows how you can make that take place.
As typical for O'Reilly materials, this book appeals to people who desire an intermediate-to-advanced understanding of how AI works. It's not for the casual user. Anyone technical involved in professional knowledge generation using AI can benefit from understanding the dynamics "under the hood." It's a good, though perhaps not ground-breaking, textbook for those of us unable to take a class in the subject. Prompt engineering may be a soft topic to many, but books like this ground the field in the science that can make or break a digital or software product.
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Reviewed in the United States on December 13, 2025
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