Ultra-Sil Day Pack
MATERIAL(S): Lightweight ultra-sil fabric for strength, durability & water resistance
CAPACITY: 20 liters
DIMENSIONS: 11 x 8 x 19 inches
WEIGHT: 2.5 oz | 72g
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
Our award-winning Ultra-Sil Day Pack is a minimalist backpack that has incredible strength-to-weight performance and packs down to the size of a tennis ball. The 30D siliconised CORDURA® fabric and reinforcing bar-tacks at stress points enable it to withstand loads many times its own weight.
With a 20L capacity, it's perfect for a summit pack, carrying groceries when on foot or on a bike, or as an extra traveling tote. The tiny packed size also easily fits onto your key ring, in a jacket pocket or a purse.
With non-padded shoulder straps, our load limit recommendation for maximum comfort is 15 lbs / 7 Kg.
- Ultra-Sil 30D siliconized CORDURA® fabric for strength and durability
- Reinforced shoulder straps for increased carrying comfort
- Packs into an attached stuff sack that includes a handy carabiner
- Packs down small so it easily fits in pockets, purses or luggage
- Perfect as a lightweight backup or travel bag
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.
Best UseSummit Pack, Groceries, Travel
FabricSiliconized Cordura fabric for strength and durability
SpecialAttachment point for a bike light
WaterproofWater resistant – please see FAQs above
Zip OptionsTwo-way zipper closure
Frequently Asked questions
Going to last?
With correct care, yes. Backpacker Magazine staff have used the same pack for over five years – but contact with sharp objects or abrasive surfaces can damage the fabric in a short space of time.
No. It is only water-resistant. Even though the pack is made of a waterproof material, water can enter through the seams (which are not sealed) and the zipper. A few minutes of light rain would not be a problem, but a downpour would result in the contents of the pack getting wet.
What is the difference between Ultra-Sil and Ultra-Sil Nano Day Packs?
The Ultra-Sil Day Pack is made from 30D Ultra-Sil Cordura nylon and includes adjustable shoulder straps and a daisy-chain webbing loop. It has a two-way zipper closure with a generous opening and weighs 2.5oz/72g.
The Ultra-Sil Nano Day Pack is made from 15D Ultra-Sil and packs down to the size of an egg. It weighs 1oz/30g. With an asymmetrical zipper, lightweight fabric, and slightly smaller capacity (18L vs 20L), the Nano is a great option for those that need to save on weight and space.