Sea to Summit Ultra-Sil Compression Sack
Sea to Summit Ultra-Sil Compression Sack
Sea to Summit Ultra-Sil Compression Sack
Sea to Summit Ultra-Sil Compression Sack
Sea to Summit Ultra-Sil Compression Sack
Sea to Summit Ultra-Sil Compression Sack
Sea to Summit Ultra-Sil Compression Sack
Sea to Summit Ultra-Sil Compression Sack
Sea to Summit Ultra-Sil Compression Sack
Sea to Summit Ultra-Sil Compression Sack
Sea to Summit Ultra-Sil Compression Sack
Sea to Summit Ultra-Sil Compression Sack
Sea to Summit Ultra-Sil Compression Sack
Sea to Summit Ultra-Sil Compression Sack
Sea to Summit Ultra-Sil Compression Sack

Sea to Summit Ultra-Sil Compression Sack

Sale price$39.95
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Ultra-Sil Compression Sack
Ultra-Sil Compression Sack
Ultra-Sil 30D Nylon · C0 non-PFAS DWR · 2000 mm HH · 5 Sizes · 53–118 g

The Ultra-Sil Compression Sack trims bulky soft gear — sleeping bags, insulated jackets, puffy layers — down by roughly two thirds of their uncompressed volume without dragging serious weight into the pack. The bluesign-approved Ultra-Sil 30D nylon shell is treated with a C0 non-PFAS DWR so it shrugs off light rain and condensation inside the pack, while three ultralight compression straps (two ladderlock, one side-release) cinch the contents fast and release even faster at camp. The attached flip-top lid keeps the straps from tangling in transit.

~⅔ Volume Compression
Compresses soft contents down by as much as two thirds of their uncompressed volume, opening pack space for layers, food, or essentials.
Ultra-Sil 30D Nylon
Lightweight 30-denier nylon shell with a higher tear strength than its weight suggests — tough enough for repeated stuffing and unstuffing.
C0 non-PFAS DWR Finish
Water-resistant C0 DWR (no PFAS chemicals) sheds light rain and pack condensation without relying on forever-chemical treatments.
Bluesign APPROVED Fabric
Shell fabric is bluesign APPROVED, certifying responsible use of resources and reduced environmental impact in the manufacturing chain.
2000 mm Hydrostatic Head
Fabric resists 2000 mm of water pressure — enough to shed pack condensation, brief rain exposure, and wet grass. Not a substitute for a dry bag.
3 Compression Straps
Three ultralight compression straps with two ladderlock buckles and one side-release buckle let you cinch down tight and pop the sack open with one hand.
Flip-Top Lid
Attached flip-top lid keeps the compression straps from tangling with other gear in your pack or travel bag.
Five Sizes
5L, 8L, 13L, 20L, and 35L sizes cover everything from a single puffy jacket to a full sleeping bag plus layers.
Sizes & Pricing
5L
53 g · 15.2 × 15.2 × 29.6 cm / 6 × 6 × 12 in
8L
64 g · 18.1 × 18.1 × 35.5 cm / 7 × 7 × 14 in
13L
82 g · 20.5 × 20.5 × 43.3 cm / 8 × 8 × 17 in
20L
96 g · 24 × 24 × 47.5 cm / 9 × 9 × 19 in
35L
118 g · 28.8 × 28.8 × 57.8 cm / 11 × 11 × 23 in
Variants
Colorways Available
3 (varies by size)
Best Use
Ultralight / Backpacking · Travel · Internal Storage
Materials
Sack Fabric
100% Nylon (Ultra-Sil 30D, bluesign APPROVED, C0 non-PFAS DWR)
Buckles
100% POM
Webbing
100% PP
Performance
Hydrostatic Head
2000 mm (water resistant — not waterproof)
Compression Ratio
Up to ~⅔ volume reduction
Closure
Drawcord neck with attached flip-top lid and 3 compression straps
What's Included
In Box
1 × Ultra-Sil Compression Sack
Warranty
Sea to Summit Lifetime Guarantee

Hand wash with mild soap and lukewarm water; rinse thoroughly and air dry away from direct sunlight.

Do not machine wash or tumble dry — the agitation and heat damage the C0 DWR finish and stress the taped seams.

Re-treat the DWR periodically with a bluesign-approved wash-in or spray-on restorer to keep water beading up.

Avoid prolonged UV exposure when storing; the 30D nylon and PU coating will degrade faster in direct sunlight.

Stuff rather than fold for long-term storage to maintain the DWR treatment and protect seam tape.

This sack is water resistant, not waterproof — for full submersion protection or use in wet conditions, pair with a dry bag inside.

Shipping Policy

Components:

All component items (wheels, drivetrains, suspension, brakes, etc.) ship within 2-5 business days of purchase.

Bicycles:

Complete bikes typically ship within 2–3 weeks due to build, tuning, and inspection times. You will receive tracking information as soon as your order is ready to ship.

Riding Gear & Apparel:

Riding gear and apparel orders (helmets, jerseys, gloves, etc.) ship within 2-5 business days.

Returns & Exchanges:

If you received the wrong size or wish to exchange an item, it must be returned in original condition—unused, uninstalled, and with all packaging intact.

For full details, please see our Refund Policy before initiating a return.

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Prepared with intention.

Every product is carefully inspected and handled by our team before it ships. From fit and function to final details, we make sure each piece is ready for the outdoors ahead—so you can focus on the experience, not the gear.

Passion drives us

At SpokeX Bike Co., bikes aren't just our business — they’re our way of life. As a rider-owned and operated shop, every decision we make comes from firsthand experience on the trail, at the race, and on the open road. We know what it’s like to chase a new line, push through the pain cave, and celebrate the ride — because we live it every day.


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