Sea to Summit Ultra-Sil Dry Day Pack

Review: Micro Waterproof Pack, Ultra-Sil Dry Day Pack

A new Ultra-Sil product, the Dry Day Pack, adds a waterproof roll-top closure for protecting your goods inside.

Sea to Summit Ultra-Sil Dry Day Pack
Sea to Summit Ultra-Sil Dry Day Pack

Sea to Summit’s line of Ultra-Sil products, including shopping bags, a small day pack, and a duffle bag, use a siliconized 30 Denier CORDURA fabric that packs up super small for transport in a pocket.

Ultra-Sil Dry Day Pack Review

Packed up in its tiny stuff sack, the Dry Day Pack is smaller than a baseball and weighs just 3.5 ounces. Unfurl it and you get a thin, slippery shell of a backpack with adjustable shoulder straps and enough room inside for a day hike. It has about 20 liters (1,200 cubic inches) of capacity.

The bonus is the pack’s roll-top closure, which is similar to what is used for kayak dry bags. It rolls over itself on stiffened strands of Hypalon, and then a small clip seals it closed.

The closure and the CORDURA fabric are waterproof. Rain will not penetrate the system. But this pack was made for terrestrial use only, and it is not guaranteed to protect your goods if dropped in a river or otherwise submerged.

Packed Up Sea to Summit Ultra-Sil Dry Day Pack
Ultra-Sil Dry Day Pack packed up in included stuff sack

To be sure, there are some big compromises with the minimal design: You can feel hard items pressing on your back through the fabric. The thin, unpadded shoulder straps are comfortable only up to a certain weight — maybe 20 pounds if you grit it. There is no hip belt or sternum strap.

But as a backup backpack, this is a neat innovation. The roll-top closure is a great upgrade to an already worthy and unique mini backpack product. It’s available now for $55.

Stephen Regenold

Stephen Regenold is Founder of GearJunkie, which he launched as a nationally-syndicated newspaper column in 2002. As a journalist and writer, Regenold has covered the outdoors industry for two decades, including as a correspondent for the New York Times. A father of five, Regenold and his wife live in Minneapolis.