---
product_id: 676665806
title: "KeenFlex Envelope Sleeping Bag 3 Season Extra Warm Waterproof Advanced Heat Control System – Ideal for Camping Backpacking Hiking Festivals Twin System"
brand: "keenflex"
price: "S$26"
currency: SGD
in_stock: false
reviews_count: 8
url: https://www.desertcart.sg/products/676665806-keenflex-envelope-sleeping-bag-3-season-extra-warm-waterproof-advanced
store_origin: SG
region: Singapore
---

# Generous 210x80cm roomy size Dual zips for customizable airflow Certified -11.7°C extreme temp KeenFlex Envelope Sleeping Bag 3 Season Extra Warm Waterproof Advanced Heat Control System – Ideal for Camping Backpacking Hiking Festivals Twin System

**Brand:** keenflex
**Price:** S$26
**Availability:** ❌ Out of Stock

## Summary

> 🔥 Sleep smart, camp warm, and never miss out on the wild side! 🌲

## Quick Answers

- **What is this?** KeenFlex Envelope Sleeping Bag 3 Season Extra Warm Waterproof Advanced Heat Control System – Ideal for Camping Backpacking Hiking Festivals Twin System by keenflex
- **How much does it cost?** S$26 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/676665806-keenflex-envelope-sleeping-bag-3-season-extra-warm-waterproof-advanced)

## Best For

- keenflex enthusiasts

## Why This Product

- Trusted keenflex brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Room to Roam:** Spacious 210cm x 80cm envelope design lets you stretch out and sleep naturally—no more mummy bag claustrophobia.
- • **Pack Light, Camp Hard:** Lightweight 1.5kg design with included compression bag makes backpacking and festivals effortless and stylish.
- • **Custom Climate Control:** Dual zippers on both sides let you tailor ventilation instantly, beating the heat or locking in warmth with ease.
- • **Ultimate 3-Season Comfort:** Lab-tested to keep you cozy from 7.2°C down to -11.7°C, perfect for spring through autumn adventures.
- • **Next-Level Durability & Softness:** Twin-layer fabric combines tear-resistant diamond polyester exterior with a plush, breathable cotton-like interior.

## Overview

The KeenFlex Envelope Sleeping Bag is a 3-season, extra-warm, waterproof sleeping solution engineered for serious campers and backpackers. Certified to withstand extreme temperatures down to -11.7°C, it features a roomy 210x80cm envelope shape, dual adjustable zippers for personalized ventilation, and a durable yet soft twin-layer fabric. Lightweight and equipped with a compression bag, it’s designed to elevate your outdoor experience across camping, hiking, and festivals.

## Description

Full description not available

## Features

- 3 Season Temperature-​ The KEENFLEX envelope sleeping bag has been laboratory tested in line with the latest global standards (EN ISO 23537-1:2016) with a certified extreme temperature of -11.7 °C and comfortable sleeping from 7.2​ ​°C. Perfect for spring, summer, and autumn camping.
- Generous Size -​ Sleep like you’re at home under your duvet! Our envelope design is much roomier than mummy sleeping bags at 210cm by 80cm. There’s space to move around and get truly comfortable, no matter how you like to sleep.
- Dual Zips -​ We have eliminated RH and LH sleeping bags: our dual zipper lets all campers adjust BOTH sides of their sleeping bag. In warmer weather, open both zips for a cooler sleep—something that’s frustrating and impossible with mummy sleeping bags.
- Twin Fabric -​ The comfort of clouds with the strength of graphene! The outer layer is made from a light, anti-tear diamond-shaped polyester while the inside has a warm, soft cotton-like feel. Water resistant, strong, and always breathable.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Age range | Adult |
| Color | Orange |
| Size | XL |
| Insulation material | Synthetic |
| Shape | Envelope |
| Material type | Polyester |
| Outer material | Polyester |
| Seasons | 3 Seasons |
| Features | Dual-layer Twin Fabric with Adjustable Dual Zips |
| Sport | Backpacking, Camping and Hiking |
| Included components | Compression Bag |
| Batteries included? | No |
| Brand | KeenFlex |
| Fill material | Polyester |
| Department | Unisex |
| Manufacturer | KeenFlex |
| Product Dimensions | 210 x 60 x 7.62 cm; 1.5 kg |
| ASIN | B089SV9JTH |

## Product Details

- **Brand:** KeenFlex
- **Colour:** Orange
- **Occupancy:** 2 Person
- **Shape:** Envelope
- **Seasons:** 3 Seasons
- **Age range (description):** Adult
- **Sport:** Backpacking, Camping and Hiking
- **Special feature:** Dual-layer Twin Fabric with Adjustable Dual Zips
- **Material:** Polyester
- **Fill material:** Polyester

## Images

![KeenFlex Envelope Sleeping Bag 3 Season Extra Warm Waterproof Advanced Heat Control System – Ideal for Camping Backpacking Hiking Festivals Twin System - Image 1](https://m.media-amazon.com/images/I/71aczXEbn0L.jpg)
![KeenFlex Envelope Sleeping Bag 3 Season Extra Warm Waterproof Advanced Heat Control System – Ideal for Camping Backpacking Hiking Festivals Twin System - Image 2](https://m.media-amazon.com/images/I/81cDa2WMzjL.jpg)
![KeenFlex Envelope Sleeping Bag 3 Season Extra Warm Waterproof Advanced Heat Control System – Ideal for Camping Backpacking Hiking Festivals Twin System - Image 3](https://m.media-amazon.com/images/I/81YN7Anm1JL.jpg)
![KeenFlex Envelope Sleeping Bag 3 Season Extra Warm Waterproof Advanced Heat Control System – Ideal for Camping Backpacking Hiking Festivals Twin System - Image 4](https://m.media-amazon.com/images/I/71FiGab+KGL.jpg)
![KeenFlex Envelope Sleeping Bag 3 Season Extra Warm Waterproof Advanced Heat Control System – Ideal for Camping Backpacking Hiking Festivals Twin System - Image 5](https://m.media-amazon.com/images/I/715Qkdj4zPL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Comfy, cosy and roomy!😀
*by E***. on 12 August 2021*

This envelope sleeping bag gives you more leg room than a mummy sleeping bag ideal for a better nights sleep. Zip on each side makes it easier to get in and out and let's you open the bag symmetrically when you get too warm. Neck baffle keeps the cold out when the temperature drops. This is not a true backpackers sleeping bag as it is not small or light enough when every kilogram of cubic centimetre counts but nevertheless it is good value for money for a camping holiday bag. Needs to be washed in an industrial washing machine or dry cleaned which I didn't find out before buying but that's not a major problem. I would certainly recommend this bearing in mind what I have said above.

### ⭐⭐⭐⭐⭐ First class sleeping bag for that price
*by D***N on 25 September 2020*

First class sleeping bag for that price. Lightweight and very warm. Zipping and unzipping from inside the bag is unusually easy. Not easy to roll back tight enough to get back in the bag but it is possible and it is then very compact. It would be perfect if it it had 2 bags, one if you want to work hard at making it very small and one if you don't care and just want to pack it.

### ⭐⭐⭐⭐ Soft and comfortable but not 3-season!
*by S***N on 10 May 2022*

I really like the soft, cosy lining; also the good strong zips on each side, and the drawstring hooded bit which held my pillow in place.But I tried it in a tent in my back garden in May and I needed a duvet on top- and a woolly jumper, pyjamas, socks and leg-warmers. It was quite a cold night - 5 degrees Celsius. Probably ideal for visiting friends who are short of spare beds but have heated homes

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-01-26*