Find Your Store
Home Page

Cart, contains 0 items

When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures.
Expert Help
Earn Rewards

SealLine
Blocker 5-30L Compression Dry Sack

4.8 out of 5 stars
25 Reviews

Out of Stock

Don't worry though, we have a lot more Stuff & Compression Sacks in stock than that.

Shop Similar Products

Blocker Compression Dry Sack

Carry your down sleeping bag, extra clothing layers, or outdoor essentials in the ultra-lightweight, space-saving design of the SealLine Blocker Compression Dry Sack. This dry sack features lightweight, fully waterproof construction to keep your gear dry without adding excessive bulk to your pack or kayak storage area.


It's packing a PurgeAir valve that releases excess air trapped inside, so you're not carrying a bonafide balloon while backpacking or paddling long distances. Additionally, it features SealLine's Continuous Compression System, which tightens down uniformly to reduce carrying bulk, but without exerting tons of pressure on delicate seams that tend to break easily.


Details

  • Compression dry sack with PurgeAir valve to release air
  • PurgeAir valve keeps it from ballooning out in your pack
  • Fully waterproof design provides a dry place for gear
  • Roll-top closure provides a secure, water-tight seal
  • Continuous Compression cinches without breaking seams
  • PackTight design with flat sides to reduce bulk
  • Item #CAS00DC
Material
70D nylon, PU coating
Volume
5L (305cu in), 10L (610cu in), 20L (1220cu in), 30L (1831cu in)
Compression
Continuous Compression System
Waterproof
fully waterproof design
Closure
roll-top closure
Dimensions
[5 L] 3.5 x 6.4 x 11.8 in, [10 L] 4.3 x 8.2 x 14.1 in, [20 L] 5.5 x 10.4 x 18.8 in, [30 L] 6.2 x 12 x 22.8 in
Claimed Weight
[5 L] 3.5oz, [10 L] 4.4oz, [20 L] 5.9oz, [30 L] 6.9oz
Manufacturer Warranty
lifetime

Overall Rating

5 based on 25 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 1 reviews
4 Stars - 3 reviews
5 Stars - 21 reviews

What do you think about this product?

View

Selecting an option will reload the available reviews on the page
5 out of 5 stars

October 6, 2023

This drysack is light in

This drysack is light in weight, but strong. I enjoy the ability to easily compact clothing and other items to reduce space in my canoe pack. I do solo canoe trips and having fewer packs to carry is a great benefit on a portage

user image
Peter K.
a Cascade Designs brand site

Originally reviewed on a Cascade Designs brand site

5 out of 5 stars

July 29, 2023

Je l'ai utilisé en camping,

Je l'ai utilisé en camping, il a gardé au sec mon sac de couchage et mes vêtements. Il est solide et se compresse facilement pour mettre dans mon sac à dos. Je suis satisfaite de mon achat.

Madeleine M.
a Cascade Designs brand site

Originally reviewed on a Cascade Designs brand site

5 out of 5 stars

June 5, 2023

Pack it down, keep it dry.

Can't say anything bad about this sack. It's sturdy; you can really haul down on the compression straps. The valve is really cool. Let's out all the trapped air with no issues and no problems with water getting in. I live in washington, it rains here a lot through winter and early spring. I've brought this on a handful of camping trips and two SAR training weekends and it kept my bag dry every time. Highly recommended.

Richard K.
a Cascade Designs brand site

Originally reviewed on a Cascade Designs brand site

5 out of 5 stars

March 24, 2023

Hands down the best compression

Hands down the best compression sacks on the market. I have tried them all.

stephen g.
a Cascade Designs brand site

Originally reviewed on a Cascade Designs brand site

5 out of 5 stars

March 23, 2023

Awesome product. Used it for

Awesome product. Used it for a backcountry winter ascent of Mt. Katahdin in Maine and it was perfect.

Mark J.
a Cascade Designs brand site

Originally reviewed on a Cascade Designs brand site

5 out of 5 stars

January 16, 2023

Excellent! the 10L works great

Excellent! the 10L works great for my Thermarest down bag, and the 20L is better for my synthetic insulation bag. I can also fit my pad and pump sack in the 20L along with my sleeping bag which is quite convenient. Durable material and straps and the breather helps push out some air once you have it rolled closed. 10/10 recommend to avoid the dreaded wet sleeping bag when you get to camp

Dave M.
a Cascade Designs brand site

Originally reviewed on a Cascade Designs brand site

5 out of 5 stars

January 16, 2023

Worth upgrading your sleeping bag stuff sack to one of these

Excellent! the 10L works great for my Thermarest down bag, and the 20L is better for my synthetic insulation bag. I can also fit my pad and pump sack in the 20L along with my sleeping bag which is quite convenient. Durable material and straps and the breather helps push out some air once you have it rolled closed. 10/10 recommend to avoid the dreaded wet sleeping bag when you get to camp.

Dave M.
a Cascade Designs brand site

Originally reviewed on a Cascade Designs brand site

3 out of 5 stars

January 6, 2023

The material is thinner than

The material is thinner than I thought it would be. The sack is too large which is my fault because I didn’t have a better understanding of the size I needed. Also, I do not like the compression system. Honestly I was looking for something like the Sealine compression sack we were issued in the US Marines for our sleeping system.

Jeremy K.
a Cascade Designs brand site

Originally reviewed on a Cascade Designs brand site

4 out of 5 stars

December 17, 2022

stuff sack upgrade

makes a great stuff sack for my kids sleeping bags and clothes. Takes up less room in the packs and helps to make sure the sleeping bag and spare clothes they are carrying stay dry.

Jacob O.
a Cascade Designs brand site

Originally reviewed on a Cascade Designs brand site

5 out of 5 stars

November 16, 2022

We are avid backpackers having

We are avid backpackers having used several varieties of these. Very durable and waterproof.

Kevin D.
a Cascade Designs brand site

Originally reviewed on a Cascade Designs brand site