Sleeping bags
Tarps&Tents
Accessories
ROCK FRONT 650 Ultralight down sleeping bag
458.40$
Lightweight sleeping bag for sub-zero temperatures. Unique design makes it easy to convert into a blanket, quilt, or underquilt for a hammock.
Updated version is insulated with premium 900+ Fill Power down.
Choose the size
Estimated delivery dates: February 2, 2026 – February 19, 2026
Description
ROCK FRONT 650 Ultralight designed for winter, cold off-season and mountaineering. Its anatomical mummy shape effectively keeps warm, while the long central zipper makes it comfortable and multifunctional.
You can easily adjust the temperature at the top or in the feet by opening the zipper partially. If it gets really hot, you can unzip it completely and use your sleeping bag as a blanket.
Special elastic loops allow you to attach the sleeping bag to your mat in a quilt mode if you need more internal space but want to turn over comfortably without fear of drafts and blowing. Reinforced loops allow you to attach 650 Ultralight as an underquilt for a hammock.
Insulated with premium 900+ FP goose down, keeping it warm, lightweight and compact at the same time.
Options:
- Mummy sleeping bag – for maximum warm keeping
- Blanket – for warm nights
- Quilt – to increase interior space (with Quilt Set Upgraded)
- Underquilt – for sleeping in a hammock (with Underquilt Set Upgraded)
- Double sleeping bag – two sleeping bags from Ultralight line can be zipped together
Features
- ultra-lightweight and packable
- insulated with 900+ Fill Power goose down
- mesh baffles for uniform insulation and quick recovery
- DWR impregnation of down and fabric
- opens for ventilation and turns into a blanket
- can be zipped with other sleeping bags of the Ultralight line
- internal zippered pocket
- anatomical footbox
- wide insulated baffle along the zipper
- wide insulated collar
- adjustable hood
Safety:
- OEKO-TEX Standard 100 guarantees that a garment is free from harmful chemicals
- PFOS and PFOA chemicals free
* Total weight of the product can vary within 2%.
** We are constantly improving our products, therefore we reserve the right to change the configuration, accessories, colors and shades of fabrics.
Specifications
Temperature rating: (Tcomfort/Tlimit) -8°C / -13°C | 17°F / 9°F
Insulation: 900+ Fill Power hydrophobic goose down
Inner and outer material: nylon micro rip-stop 10den
Zipper: two way YKK #3
Weight:
- S Medium: 830g (insulation weight: 565g) / 29.28 oz (insulation weight: 19.93 oz)
- M Short: 900g (insulation weight: 610g) / 31.75 oz (insulation weight: 21.51 oz)
- M Medium: 965g (insulation weight: 650g) / 34.04 oz (insulation weight: 22.93 oz)
- M Long: 1015g (insulation weight: 690g) / 35.79 oz (insulation weight: 27.87 oz)
- L Short: 1025g (insulation weight: 695g) / 36.16 oz (insulation weight: 24.52 oz)
- L Medium: 1080g (insulation weight: 730g) / 38.10 oz (insulation weight: 25.75 oz)
- L Long: 1135g (insulation weight: 770g) / 40.02 oz (insulation weight: 27.16 oz)
Compression sack weight: 60g / 2.12 oz
Compressed size: 23×20 cm / 9.1 × 7.9 in
Manufacturer: ROCK FRONT (Ukraine)
Additional information
| Weight | 0.7 kg |
|---|---|
| Dimensions | 22 × 32 × 19 cm |
| color |
Anthracite ,Dark-Blue ,Grey ,Lemon |
| temperature-rating |
-5°C…-11°C ,Under -11°C |
| insulation |
900+ Fill Power goose down |
| technology |
Box baffles |
| extra-features |
Blanket mode ,Footbox ventilation ,Inside pocket ,Quilt mode ,Underquilt mode ,Zips with bags (YKK 3) |
Reviews (5)
5 reviews for ROCK FRONT 650 Ultralight down sleeping bag
Shipping & Delivery
Shipping
Free worldwide shipping for orders from 100€ or 100$. If the order amount is less, you have the option to pay for shipping immediately.
Customs duties and VAT
These must be paid separately. You can find information about importing goods into your country here.
Delivery terms
We ship orders within 1-3 business days. Average delivery time is 8-20 days.
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Oleksiy –
I recently bought this bag. The quality, like everything else from this manufacturer, is top. Not yet tested in trip, but the first impression is wow!!!
Dmytro –
The sleeping bag is cool, it proved itself well in the winter Carpathians, I plan to test it in combination with a quilt in colder temperatures!
Ksenia –
Thank you very much for a quality product made in Ukraine! On the advice of a friend, I paid attention to this sleeping bag, and I’m happy with the purchase. Everything matches the description, high quality, and very pleasant to the touch. Looking forward to larger sizes to order another one.
Miles –
From the beginning of my backpaking life, I wanted to buy a down sleeping bag. It takes up much less space and is more pleasantly warm compared to synthetics. It retains its temperature characteristics longer.
I bought the sleeping bag as a basis for a sleeping system for all seasons. Next in line is a quilt with a sheet. I think 350 Pro will be just right. And then let the people from RockFront tell me whether the internal space of the quilt will be enough for this sleeping bag.
I tested the sleeping bag in two hikes.
The first one was on Kukul. We spent the night in kolybas, so we didn’t even put the tent out.
But the second one was a test)
Overnight on Mount Velykyi Verkh at a temperature of about 10 degrees below zero.
I also used a fleece liner.
I’ll say this, it was close to the capabilities of the sleeping bag at that moment. I slept well, did not freeze.
All this is subjective and cannot be used as a guide.
Thank you Rock Front for making backpaking accessible. Thank you for developing and improving.
Update: review of the previous version
Lars Anton Mattsson –
Really enjoyed the sleeping bag. It’s so light yet incredibly fluffy. Only problem I’ve had so far is that it’s so hard to close the zipper the last centimeters on the top, yet it’s even harder to get it back open. Might have been a manufacturing issue with mine. But for the price it’s a superb investment.
Store manager ROCK FRONT –
Thank you for the review! I’m glad you liked the sleeping bag. I apologize for the inconvenience with the zipper — it’s a self-locking zipper and can sometimes snag when closing. We’ll work on resolving this.