BlockerLite™ Pump Sack

  • Therm-a-Rest BlockerLite™ Pump Sack - In Use
  • Therm-a-Rest BlockerLite™ Pump Sack - Size Detail
  • Therm-a-Rest BlockerLite™ Pump Sack
  • Therm-a-Rest BlockerLite™ Pump Sack
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Therm-a-Rest

BlockerLite™ Pump Sack

A versatile sack for inflating your pad or protecting your gear.
  • Timesaving: Inflates your pad faster than breath inflation. Easily snaps onto Therm-a-Rest valves.
  • SealLine® Protection: Built with ultralight waterproof BlockerLite™ material from our pals at SealLine, this dry sack is extra durable and features welded seams to keep your gear protected.
  • Versatile: Doubles as a lightweight 20-liter dry sack when it’s time to hit the trail.
  • Not compatible with Classic Valves (valves on pads pre 2020).
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Description

For lightning-fast inflation and water protection, the BlockerLite Pump Sack gives you a versatile and lightweight option for gear storage and mattress inflation. Designed with our friends at SealLine, the pump sack features durable and welded seams. Big enough to hold 20-liters of gear, it’s the perfect size to store extra clothing before inflating a high-volume air pad that features the WingLock or TwinLock valve.

Tech Specs

SKU:
13228
Size:
20 L
Color:
Green
Weight (Standard):
5 oz
Weight (Metric):
0.15 kg
Width (Standard):
5.5 in
Width (Metric):
14 cm
Length (Standard):
10 in
Length (Metric):
26 cm
Height (Standard):
24 in
Height (Metric):
61 cm
Packed dimension (Standard):
6 in x 6 in x 1 in
Packed dimension (Metric):
15 cm x 15 cm x 2.5 cm
Top fabric type:
20D Rip Nylon
What's Included:
NA
Material(s):
Polyester
Country of Origin:
Made in China

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FAQs and Documents

Shipping and Returns

Free Shipping on Orders over $50

We offer complimentary FedEx Ground shipping for orders over $50. Learn More

Orders Shipped in 1-2 Days

We do our best to get all orders out within one business day, Monday through Friday. Learn More

No Hassle Returns

We accept returns within 30 days of purchase. All returned items must be in new condition. Please be sure no dirt, grass or pet hair is on the item you are returning. Learn More

Limited Lifetime Warranty

Every piece of Therm-a-Rest gear is designed to endure the rigors of your time in the backcountry. We offer a Limited Lifetime Warranty on all products, except electronic devices, which have a 2-year Limited Warranty. Visit our Therm-a-Rest warranty page for more info.

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Overall rating: 3.1290324 / 5 from 31 reviews.

AI Generated Review Summary

The BlockerLite™ Pump Sack is generally effective for inflating pads, though some users have reported issues with it not staying attached to the sleeping mat.

Summary topics

  • Attachment Stability: 16%
  • Pump Effectiveness: 40%

Review topics: ["material","dimensions","works","pump","valve","drying","pad","mat"].

Review highlights

  • "I'm really glad that ThermaRest has finally offered a waterproof pump sack to accompany their sleeping pads." — Ken
  • "Good fitting pump sack" — Normand R.
  • "A Very Nice Product, A Near Miss" — Ken

Reviews

Blockerlite pump sack

"I’m using it to inflate my NeoAir XTherm . You have to be very careful when using it as it disconnects easily from the Wingnut valve on the pad. Other than that it’s great. After a long day backpacking in the winter I don’t have to inflate the pad with my breath. The light gray pump sack that comes with the pad is useless. The seams on the sack are not taped so after a little air gets in the pad as you try to put more air in it leaks out of the seams on the sack and I have to inflate the pad with my breath. That’s why I purchased the Blockerlite pump sack."

— James L. (4/5)

Worth buying!

"Nice large pump sack. This makes filling my NeoAir x-therm pads a breeze. made of good material as well."

— Jay K. (5/5)

Do well what is it

"Do well what is it for"

— Normand R. (5/5)

Easily broken

"When pressure was applied, the dorsal seal came off easily and disassembled. Fragile and unreliable."

— Yamaninemuru (1/5)

Pumpsack does not work anymore.

"It seems that the fabric is not airtight anymore and it is not possible to get any air into the mattres. Is it possible to get the sack airtight again. How can i do this?"

— Chris (4/5)

Excellent

"Excellent"

— Joel S. (5/5)

Will Not Stay Attached No Matter What I Try

"This bag will just not stay attached to my sleeping matt, at most you get 2 pumps out of it and it falls off, the attachment itself is extreemly loose and ill fitting and just slips on and off with no effort at all, the pump bag that came with my matt works great it that clicks on with a audible click and has a secure grip on my matt and easily inflates it. I only bought this pump sack so i could use it as a dry bag to protect my matt and obviously to also inflate it and to remove the need to carry a separate pump sack. thankfully i tested this pump sack indoors and discovered it was useless rather than finding out when i was off camping"

— Robert C. (1/5)

Unfortunately, the sack does not

"Unfortunately, the sack does not stay attached to my sleeping pad, unlike a friends sack I used, so it does not work."

— Nicholas S. (1/5)

Solid stuff sack, underwhelming pump sack

"I bought this in order to fill my Topo Luxe Neo Air, which is a pain to use my breath to fill at the end of a long day hiking. As many reviewers have pointed out, the sack's connection point with the mat is very weak and any major movements while pumping cause it to pop off. In my home I can manage to fill the mat without the sack disconnecting, but in my tent I find it almost impossible given the lack of movement space and awkward angles. But hey, at least it holds my clothes in my backpack. I recommend passing on this product until Thermarest designs a better one."

— Shane (2/5)

Bad design AND bad quality EQUALS Ultra bad product.

"Design issues: 1. The mount is not firm enough and will frequently disconnect from your sleeping pad. 2. The mount is made of hard plastic and only glued to one side of a soft sack. This is bound to fail sooner or later. Quality: It only took one use for parts of the glue/seal to fail between the pump sack and the mount. This is not only because of bad design, but also because the glue in parts of the seal never had bounded to the mount. It's a nice idea ... and you can probably keep it alive be frequent repairs."

— L.L. (1/5)

Q&A