Blocker™ Compression Dry Sack
- Versatile materials: Lightweight 70D polyurethane-coated nylon materials are a tougher, more resilient cousin to the ultralight BlockerLite materials. More durable and versatile, these materials are great for all-around use with confident waterproof protection.
- Smarter compression: Unlike conventional systems that pull against seams, our Continuous Compression system encircles the sack to minimize seam strain, maximizing durability for dependable protection.
- PurgeAir™-equipped: Our unique and waterproof PurgeAir valve vents trapped air, helping the sack compress further after being sealed, and is both more durable and more reliably waterproof than waterproof/breathable fabric membranes.
- Waterproof closure: Roll-top closure features a wrinkle-free stiffening strip to ensure a secure seal when closing the dry sack.
- Durable construction: Fully welded seams result in stronger and more durably protective construction compared to sewn-and-taped seams.
- Efficient-Packing: PackTight™ packing system sacks feature flat-sided, rectangular shapes that nestle closely together, packing 20% more efficiently than rounded sacks for easy, space-saving organization.
|5 LTR||10 LTR||20 LTR||30 LTR|
|Weight (Standard)||3.5 oz||4.4 oz||5.9 oz||6.9 oz|
|Weight (Metric)||0.10 kg||0.12 kg||0.17 kg||0.20 kg|
|Width (Standard)||3.5 in||4.3 in||5.5 in||6.2 in|
|Width (Metric)||9 cm||11 cm||14 cm||16 cm|
|Length (Standard)||6.4 in||8.2 in||10.4 in||12 in|
|Length (Metric)||16.5 cm||21 cm||26.5 cm||30.5 cm|
|Height (Standard)||11.8 in||14.1 in||18.8 in||22.8 in|
|Height (Metric)||30 cm||36 cm||48 cm||58 cm|
|Volume (Standard)||305 cu. in||610 cu. in||1220 cu. in||1831 cu. in|
|Volume (Metric)||5 liters||10 liters||20 liters||30 liters|
|Material(s)||70D polyurethane-coated nylon||70D polyurethane-coated nylon||70D polyurethane-coated nylon||70D polyurethane-coated nylon|
|Country of Origin||Made in China||Made in China||Made in China||Made in China|
Our packing system sacks are sized volumetrically in liters. To help illustrate how those volumes translate to real world use, here are some typical things you might put in various sizes of packing system sacks:
- 2.5L = small personal items, snacks, or a first aid kit
- 5L = a few meals for two, baselayers, or other small essentials
- 10L = a down jacket, food for the weekend, or a small sleeping bag
- 20L = a typical sleeping bag, a couple changes of clothes, or bulkier gear items like a tent or camp kitchen setups
- 30L+ = from 30L and up, most items for an overnight trip can fit into one of these sizes
SealLine products use three ratings to describe water resistance:
- Splashproof: Withstands light rain and splashes. Only some of our products fall into this category. Suitable for use where light water resistance is sufficient, such as summer backpacking.
- Waterproof: Withstands quick submersions. Most of our bags fall into this category and are suitable for canoe, kayak and rafting use where boats may tip, flip or be swamped.
- Submersible: Withstands 1 meter of submersion for 30 minutes (IP-67 standard). Suitable for use in extreme and prolonged wet situations.
With such ratings, water resistance depends on the user carefully and properly sealing the closure. For roll-top closures, this means a minimum of three tight, wrinkle-free rolls. For zipper closures, the zipper must be completely and properly closed.
We recommend a minimum of 3 folds (aka “rolls”) to properly seal a roll-top packing system sack. For an optimal seal:
- a. Make sure the stiff sealing strips are wrinkle-free. Close the packing system sack so that the sealing strips are pressed together
- b. While holding strips together, push down to “burp” out trapped air. Once trapped air has been “burped” out, tightly fold the top over several times so that the roll-top closure has been folded at least 3 times
- c. Connect the buckle in the direction opposite to the direction the material was folded
Welded seams use radio frequencies (RF) to join two pieces of coated fabric together at the molecular level, effectively bonding them together as one. This strong, reliably waterproof construction method is far superior to sewn-and-taped seams.
With sewn-and-taped seams, two pieces of coated fabric are held together with thread and a piece of protective tape is placed over the threads and seam to provide water protection. A RF welded seam can withstand up to 2x more stress than a sewn-and-taped seam, resulting in a more protective and longer-lasting seam. This is why we use welded seams with all of our dry bags.
- Dry bags come from the paddlesport world. They are made from heavy-duty materials that withstand the stresses of exposed, demanding use in or around wet, aquatic environments. Dry bags are frequently used by paddlers (e.g., canoe, kayak, raft, SUP), though they are increasingly used on land in circumstances where their durability and protection against the elements are beneficial.
- Packing system sacks come from the camping/backpacking world and are typically made from lightweight or ultralight materials. They are meant to be put inside a larger pack or bag, providing selective water protection and/or organization for specific items (e.g., sleeping bag or clothing) with minimal overall weight penalty.
We Believe in What We Build
At SealLine, we take pride in engineering the highest-quality outdoor gear available, and we stand behind everything we make. SealLine gear is built to be exceptionally durable and easily repaired. And we back it up with the best service in the industry, all to keep your gear performing for you—and out of landfills. Visit our SealLine Warranty page for more info.