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Reviews > Stuff Sacks > Dry Bags > Seal Line BlockerLite Dry Sack > Test Report by Nancy Griffith

July 15, 2017


NAME: Nancy Griffith
EMAIL: bkpkrgirlATyahooDOTcom
AGE: 51
LOCATION: Northern California, USA
HEIGHT: 5' 6" (1.68 m)
WEIGHT: 128 lb (58.10 kg)

My outdoor experience began in high school with a canoeing/camping group which made a 10-day voyage through the Quebec wilds. I've been backpacking since my college days in Pennsylvania. I have hiked all of the Appalachian Trail in Georgia, Tennessee and North Carolina. My typical trip now is in the Sierra Nevada in California and is from a few days to a few weeks long. Over the past few years I have lowered my pack weight to a lightweight base weight of 15 lb (6.8 kg) while still using a tent, stove and quilt.



SealLine BlockerManufacturer: Cascade Designs, Inc.

Year of Manufacture: 2017

Manufacturer's Website

2.5L: $15.95
5L: $18.95
10L: $21.95
15L: $23.95
20L: $26.95

Listed Weight: --------------------Measured Weight:
2.5L: 1 oz (28 g) ------------------1.0 oz (27 g)
5L: 1.2 oz (33 g) ------------------1.2 oz (34 g)
10L: 1.6 oz (44 g) ----------------1.5 oz (43 g)
15L: 1.8 oz (52 g) ----------------1.8 oz (51 g)
20L: 2.1 oz (59 g) ----------------2.0 oz (57 g)

Sizes (W x L x H):
2.5L: 2.8 in x 5.3 in x 9.5 in (7 cm x 13.5 cm x 24 cm)
5L: 3.4 in x 6.5 in x 12 in (9 cm x 16.5 cm x 30 cm)
10L: 4.4 in x 8.3 in x 14 in (11 cm x 21 cm x 36 cm)
15L: 4.9 in x 9.3 in x 16 in (12 cm x 23.5 cm x 41 cm)
20L: 5.5 in x 10.4 in x 19 in (14 cm x 26.5 cm x 48 cm)

Colors Available: Blue, Coral, Orange, Yellow
Colors Tested: Blue (20L), Coral (2.5 and 5L), Orange (10L), Yellow (15L)

Made in China


Package FrontPackage BackThe Seal Line Blocker Lite Dry Sacks are ultralight, waterproof dry sacks with a rectangular shape to help make packing more efficient. They are made from PVC-free material of 20D Silicone Polyurethane-coated nylon and have a roll-top closure that buckles.

The top of the closure is quite stiff on both sides for a tight double seal. The seams are fully-welded with no-stitch seams that are claimed to be 50% stronger than sewn seams.

Each size of the dry sacks comes in a variety of four different bright colors with a large SealLine logo near the bottom of the sack. There is a tag inside the sack that notes the size of the sack.


My initial impression was that the dry sacks seemed much as I expected based on the website. I received a variety of colors but with four colors available and five dry sacks, my smallest two sizes are the same color. So, for the most part, it will be easy for me to identify which sack is which size just based on the color. Nice.

leashEach sack came in a cardboard sleeve with an ingenious leash to hold the sack to the packaging until purchase. Rolled up in each sack was an instruction leaflet in four languages.

Next I noticed just how light these sacks are. The top closure is substantial and seems heavy-duty but the sack fabric is so lightweight that the overall sack is really light.

I really like the bright colors that won't tend to blend in with the colors in nature. That way I'll be able to easily find the sacks both in camp and in my backpack.

The sizes seem to provide options for my backpacking needs. The smallest sack would be nice for my phone, headlamp, note pad and other small items. The 5L sack would fit my kitchen cookset and stove nicely. The 10L sack is just right for my double-wide quilt and two pillows and as luck would have it, the sack matches my quilt color. That will make it easy to remember. The 15L sack will fit plenty of clothing and can be rolled down if it is too large. And the 20L sack should fit our double-wide winter sleeping bag which happens to be the same color as the sack too!

I don't like to use pack covers so having waterproof sacks inside my backpack is for me the best way to protect my gear.

The sacks seem to be round based on my being used to round stuff sacks, but when I examine the bottom closely it is a rectangular shape which should make my gear want to fit in that way too. We'll see how that works once I get packing.


instructionsThe instruction leaflet gives instructions on how to properly close the sack by closing the top, rolling it over three times and snapping the buckle.

The care and use instructions say that the sacks should be cleaned and aired out after each use. They are to be stored dry, inside and out. Life of the sack can be extended by padding any sharp corners to minimize wear of the fabric. Insect repellents and solvents are bad news for the fabric and should be kept away.

The roll-down closure is not guaranteed to remain waterproof if the sack is submerged so sensitive electronic equipment, cameras, etc. need to be stored in a more sealed case for this environment. They are intended for rain, splash and spray and not for submersion.

Lastly, there is a limited warranty for life against manufacturer's defects in materials and workmanship.


unrolledThe Seal Line Blocker Lite Dry Sacks are ultralight, waterproof dry sacks in varying sizes that are rectangular for efficient packing.

Initial Likes:
Light weight
Variety of colors

Initial Questions:
Interested to see how these pack as rectangles

This concludes my Initial Report. Please check back in two months to find out how these sacks are doing in the field. Thanks to Cascade Designs and for the opportunity to test these sacks.

This report was created with the Report Writer Version 1. Copyright 2017. All rights reserved.

Read more reviews of Cascade Designs gear
Read more gear reviews by Nancy Griffith

Reviews > Stuff Sacks > Dry Bags > Seal Line BlockerLite Dry Sack > Test Report by Nancy Griffith

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