Radical ULXUltralight down sleeping bag (9°C)

Radical ULX is the simplest and lightest sleeping bag in the series. We designed it for those who count every gram and every liter of space – whether they pack in a saddlebag, a pannier or a side pocket of their backpack.

It weighs just 190 g and packs down to 1.5 litres – less than a standard water bottle. Perfect for fast adventures, bikepacking, lightweight trekking and multi-day motorcycle routes.

It’s filled with Polish white goose down 900 CUIN (95/5), RDS-certified – the same fill we use in our expedition models. In this version, it’s used in a lighter setup to keep weight low while still providing warmth during chilly summer nights.

Simple chamber construction allows the down to loft evenly and helps avoid cold spots.

The outer layer is made from GELANOTS Ultra Light ripstop fabric, which resists moisture and abrasion. There’s no zipper – the narrowed opening keeps heat inside and helps keep the weight down.

Drying loops on the outside let you hang it out in the morning. The set includes two bags – one compression sack for transport and a mesh storage bag to help preserve loft between trips.

ULX works as a standalone summer bag, or as a modular component in a layered sleep system – for example, paired with the Phantom when you’re covering 40–50 km a day and can’t afford to carry more than you need.