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Ultra-Sil Compression Dry Sack

Ultralight compression for when things should be dry

$32.95 – $52.95

Sleeping Bag Temperature Ratings Explained

The EN Rating scale is a scientific test to determine the warmth of a sleeping bag. The test produces a Lower rating (for male sleepers) and a Comfort rating (for female sleepers). Both are listed in the features table on the product page.

A unisex sleeping bag with a Lower limit of 23ºF means a man should be comfortable down to air temperatures of 23ºF. The same bag will also have a Comfort limit, in the realm of 32°F, so a woman would be comfortable down to an air temperature of 32ºF. These ratings require a sleeping mat with an R-Value appropriate for expected ground temperatures – without this, the sleeping bag itself is unlikely to keep the sleeper warm enough.

A variety of factors impact sleeping bag warmth - the above temperatures are merely guidelines, not guarantees. It’s important to think of a sleeping bag, an appropriately insulating sleeping pad and a liner as a sleep system. For example - if you plan on sleeping in nighttime air temperatures of 27ºF / -3°C, choose a bag with a gender-appropriate rating of 23°F / -5°C, plus a sleeping mat with an R-Value of 2.5 to 3, and consider a Reactor thermal liner.

$32.95

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Description

The Ultra-Sil™ Compression Dry Sack is a super lightweight dry sack designed to compress bulky clothing or other squishable gear that lives inside your pack. Made from Ultra-Sil™ 30D CORDURA® Nylon fabric with an eVent® fabric base, the air can be rolled out but can't get back in. It's an ideal option for use inside a backpack during longer lightweight hikes, adventure travels, cycle touring and any activity where you need to maximize pack space by compressing your bulky items to one-third of their volume. It employs waterproof seams, a hypalon roll-top, non-wicking closure and is super lightweight.

Read more about which dry bag is right for you HERE

Highlights

Durability

Keep it inside your pack and away from hard edges and corners.

Waterproofness

Greater than 2000mm hydrostatic head – more than sufficient water protection for use inside a pack

Best Use

Backpacking, Hiking & Bike Packing

What this bag could hold

XXS / 3.3 liters: socks, underwear & beanie
XS / 6 liters: Extra layers or a high-performance sleeping bag (such as the Spark 25°F) or a quilt (Ember 25°F)
S / 10 liters: a two-season or a high-end three-season down sleeping bag or a larger puffy jacket
M / 14 liters: a mid-range three season sleeping bag
L / 20 liters: a three-season synthetic sleeping bag plus a Reactor Liner

Features

  • Waterproof hypalon roll-top closure with lid and 4 straps for compression
  • Air permeable eVent fabric base allows air to be pushed out but water can't get in
  • Lightweight Ultra-Sil body
  • Waterproof seams - double stitched and tape sealed
  • Reinforced stitching on all stress points
  • Roughly half the weight of the original eVent Compression Dry Sack
  • As of 2018: Features the patent-pending 5/8in | 15mm Field Repair Buckle with stainless steel pins

Technical Features

30D Ultra-Sil®

An incredibly lightweight yet durable fabric used in a large number of Sea to Summit products. This 30 denier Nylon is made with CORDURA® yarns for strength, woven into a ripstop pattern. Two versions of the fabric are used:

  • water-resistant products (such as the Ultra-Sil™ Stuff Sacks) are siliconized on both sides for ultimate packability
  • waterproof products (such as the UltraSil™ Dry Sack are) siliconized on the outside and PU-coated on the inside to allow seam taping.

Both versions have a hydrostatic head greater than 2000mm – which makes them more than adequately waterproof for the types of environments they are intended for.

eVent™ Fabric

eVent™ fabric is an air-permeable, waterproof laminate used in two different functional areas in Sea to Summit products:

 

  1. In the base of our best-selling eVent Compression Dry Sacks, Evac Dry Sacks and Ultra-Sil™ Compression Dry Sacks. In this application, the laminate utilizes a 40 denier nylon face fabric: the material allows air to be pushed out of the dry sack/compression dry sack but prevents water from entering. This means you can compress the air out of a dry sack without needing a purge valve!.
  2. In the upper section of our Quagmire and Alpine Gaiters. In this application, the laminate utilizes a 70 denier nylon face fabric. The material allows perspiration to pass through easily but prevents external water from entering. The result: waterproof protection and superior breathability!

Cordura®

Cordura® is a special type of nylon yarn used for its strength. These yarns are used in two different product areas:

>  In the siliconized Ultra-Sil™ fabrics used in Ultra-Sil™ Dry Sacks, Stuff Sacks, Compression Sacks, Pack Covers, Travelling Light and Travel Essentials products
>  In the foot section of the extremely tough eVent® Quagmire Gaiters.

    Tech Specs

    Product Details

    Best Use
    Backpacking, Hiking & Bike Packing
    Closure
    Waterproof roll-top closure with lid and compression straps
    Material(s)
    Ultra-Sil nylon body and eVent fabric base
    Repair Buckle Size
    5/8in | 15mm (2-Pin)
    Shape
    Cylindrical with round base for easy packing
    Waterproof
    Yes
     
    XXS 3.3 LITER
    XS 6 LITER
    S 10 LITER
    M 14 LITER
    L 20 LITER
    COMPRESSED VOLUME
    DIMENSIONS
    GEAR CAPACITY (L)
    WEIGHT
    3.3L to 1.3L
    5 x 10 in / 13 x 25 cm
    3.3 L
    2 oz / 50g
    6L to 2L
    6 x 14 in / 15 x 35 cm
    6 L
    2.3 oz / 56g
    10L to 3.3L
    7 x 16 in / 18 x 40 cm
    10 L
    2.6 oz / 75g
    14L to 4.5L
    8 x 18 in / 20 x 46 cm
    14 L
    3.2 oz / 90g
    20L to 6.7L
    9 x 20 in / 23 x 50 cm
    20 L
    3.4 oz / 100g

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