Ultra-Sil Pack Cover
Highlights
PACK SIZE: Fits a 15 to 30 liter pack
PACKED SIZE: 4 x 2.5 in | 10 x 6 cm
WEIGHT: 2 oz | 57 g
RECOMMENDATION: If you stow any gear externally on your pack, we would recommend buying a Pack Cover a size larger than normal.
Shipping & Returns
Our warehouse is actively shipping orders from 8am to 1pm MST Monday through Friday. Most orders ship in one business day, but the transit time can take up to 7 days, depending on your distance from Boulder, Colorado.
2nd Day and Next Day Air orders will ship same day if placed by 1pm MST, Monday-Friday (except holidays).
All orders are eligible for fast and easy returns within 60 days of purchase.
For more details, please check out our Help Center
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Description
The Ultra-Sil Pack Cover ends the debate about whether you should carry one or not. It's a tiny and compelling solution and the medium size weighs less than four ounces. Plus it packs into its own small stuff sack - why wouldn't you carry one?
Technical Features

An incredibly lightweight yet durable fabric used in a large number of Sea to Summit products. The 30 denier bluesign Approved nylon is made with CORDURA® yarns for strength. A Non-PFC DWR finish on the outer face helps to shed water.
The inside is polyurethane-coated – in dry bags, the seams are seam-taped.
The hydrostatic head is greater than 2000mm – more than adequately waterproof for the types of environments Ultra-Sil dry bags, stuff sacks and compression sacks are intended for.

Cordura® is a special type of nylon yarn used for its strength. These yarns form the heart of the siliconized Ultra-Sil™ fabric, used in:
- Storage products: Ultra-Sil™ Dry Bags, Ultra-Sil™ Stuff Sacks, Ultra-Sil™ Compression Sacks
- Camping/Backpacking Accessories: Ultra-Sil™ Pack Covers, Ultra-Sil™ Folding Bucket and Kitchen Sink
- Travel products: Garment Mesh Bags, Toiletry Bags etc
- Travel Essentials: Ultra-Sil™ Daypack, Ultra-Sil™ Dry Daypack, Ultra-Sil™ Shopping Bag
Tech specs
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Best UseUltralight Backpacking
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Material(s)30 denier Ultra-Sil™ nylon
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WaterproofYes
XS | S | M | L |
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Frequently Asked questions
Aren't most backpacks waterproof without a cover?
No. Water will enter through seams and zippers (especially in really wet parts of the world)
Why choose the Ultra-Sil Pack Cover over the Nylon version?
The Ultra-Sil Pack cover is slightly lighter and has a smaller packed volume - it is more suitable for weight-conscious backpackers
Will a pack cover make my pack completely waterproof?
In most cases, waterproof enough - wind-driven rain can still enter through the space between your back and the harness