Lightech SM 850 Synthetic Sleeping Bag

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Light, compact, and reliable in damp conditions, this is a smart choice for summer hut-to-hut hikes.

Ferrino says: 

These sleeping bags with extremely reduced size and weight offer excellent heat performance thanks to the “shingle” construction.

Our Verdict

The Ferrino Lightech SM 850 hits a strong balance between weight, packability and warmth. At 732g and compressing down to 14 × 30cm, it’s remarkably compact for a synthetic bag in the +4°C range. The shingle construction distributes insulation evenly, maintaining warmth consistently without cold spots.

The hood adjustment is easily accessible with one hand, and the 2-way zip at the foot allows for easy venting in warmer conditions. For synthetic insulation, the HTF Compact fill performs well in humid or damp environments and dries quickly if it does get wet.

The bag is most at home in mild spring to early autumn weather. Cold sleepers may find the comfort limit optimistic, but for most, it offers a good margin. 

– Reviewed by Ultralight Outdoor Gear

Features

• Minimum heat loss, thanks to the staggered seams
• Filling with “shingle-tile” construction
• Excellent warmth thanks to the synthetic “HTF Compact” filling
• Easier opening with the “One Touch” system
• Cold protection hood
• 2-way zipper
• Zip baffle
• Bag with compression tapes included to reduce sleeping bag volume for easier insertion into the backpack

Specifications

• Weighs: 732g (ex bag)
• Temperature °C: +20 / ♀ +8 / ♂ +4 / -10
• Dimensions (cm): 215 x 80 x 50 cm – MAX 14 x 30 cm – MIN 14 x 25 cm

Material & Construction

• Shell: 100% Nylon 20D 400T
• Liner: 100% Polyester
• Filling: 390 g H.T.F. Compact

Help & advice:

• The Ultimate Guide to Lightweight Sleeping Bags
• Time-Saver Guide to Choosing a Sleeping Bag
• Sleeping Bag Shapes & Sizes