One Planet Bungle -12 Sleeping Bag (1075 Grams)

The Bungle sleeping bag is the all-rounders choice, balancing exceptional comfort with loads of features whilst maintaining lightweight status. Offered in three temperatures, rated to the lower limit for both males (M) and females (F). A -12 M (-4 F) °C or -15 M (-8 F) °C or -17 M (-9 F) °C tested in accordance with ISO 23537.1. The Bungle is available in three sizes – small, regular and large, and filled with Non PFC hydrophobic down. The tapered rectangular shape gives space to move, while the vertical baffle system, neck baffle and twin draft tubes keep warmth where you need it. The shell is made from durable, water-repellent and highly breathable 10 D Vapour Vent V2 fabric, with a full-length YKK #5 zip and anti-snag locking slider. There’s a separate foot zip so it can be opened fully.

How Warm Will I Be?
ISO 23537-1 temperature testing provides a temperature limit at which a “standard male" or “standard female" will sleep in thermal equilibrium (have a comfortable night’s sleep).

Both the ‘standard male’ and ‘standard female’ are based on a 25-year-old who is fit and healthy. If you’re older or younger, you may sleep colder than the ‘standard’, so we would recommend considering a warmer bag. Your other equipment (sleeping mat, pillow, tent style) the environment (weather, location) and your biology can affect warmth over the night.

The Importance Of Independent ISO 23537-1 Testing
Each ONE PLANET Bungle sleeping bag is temperature rated in accordance with the International Organisation for Standardisation 23537-1 (Requirements for sleeping bags). This is the only globally recognised standard for the temperature testing of sleeping bags, and gives ratings for both females and males. Testing sleeping bags to ISO 23527-1 allows users to make informed, educated and accurate decisions.

The ISO 23537-1 testing methods allows objective comparisons of the warmth of different shapes (mummy and tapered rectangular), sizes (small, regular and large), fill quality (synthetic fill, 700 down fill power or 800 down fill power), construction and design.

Not all manufacturers test to this standard, nor do they give information about how they arrive at their temperature ratings. As a result, care should be taken when comparing claims of warmth.

Baffle Construction
ONE PLANET baffle technology maximises thermal efficiency.

The vertical baffle system uses vertical and horizontal chambers to keep lofty down in the right spot, regardless of night-time manoeuvres. Box wall baffles connect the outer shell and internal fabric, creating 3D chambers that promote lofting, aid even insulation and stop draughts. The differential cut also assists lofting: the internal fabric is cut narrower than the outer shell, making the bag’s inner circumference smaller than its outer.

Zips
Every detail counts. We use YKK #5 locking zips with an anti-snag slider. The anti-snag covers make jamming zips a thing of the past, while the YKK #5 zip is more reliable, durable and lasts longer than lower-gauge zips.

Using a locking slider stops the zip from creeping open, so it will stay where you want it to for a good night’s sleep.

Vapour Vent V2
The Vapour Vent (V2) fabrics are lightweight, breathable nylon with Non PFC water-repellent treatment that promotes hands-free moisture management.

The smooth fabrics are light and warm to the touch, ideal for use on multi-day journeys. The tight weave and high thread count ensures they are ‘downproof by construction’. The majority of our bags use the silky, light, 10-denier version both inside and out, while some use the more durable 20-denier option.

Hydrophobic Down
All ONE PLANET down has been treated with a Non PFC hydrophobic water repellency application. This causes the down to repel water rather than absorb it, minimising clumping and helping the down in your sleeping bag stay dry and lofty.

Hydrophobic Down allows your sleeping bag to dry quicker and stay warm for longer, and is especially important for bags used on multiday journeys or in wet conditions.

Down Distribution
In ONE PLANET Bungle sleeping bag, 55 per cent of the down fill is on the top and 45 per cent is on the bag’s base. We’ve selected this distribution of down after carefully considering how real people move and sleep – after all, we want it to work in real life! This down distribution ensures you stay warm in every position, preventing a cold back as you roll, wriggle and move.

Premium Loft
The quality of down used in a Nitrous sleeping bag makes a huge difference to its warmth, weight, durability and compactness, as well as the loft recovery of the fill. We use 800-850 loft Hydrophobic Down Non PFC – our premium choi