Pleasant Hill Grain


Shopping Basket

  • This item was added
  • items in your basket
  • (close)

Ask a product expert! Click here.


Today we're shipping orders for in-stock items placed October 16. Our Hampton showroom is temporarily closed. Despite high order volume, our amazing shipping team is rapidly reducing processing times—we’ve recently added 17 new team members! We greatly appreciate your business and we’re doing our very best to serve you, as Jim C. of California tells. A word to the wise: Because resupply of many product lines remains daunting, and processing times may grow again in coming weeks, there’s never been a year like this to do your Christmas shopping and other year-end buying very early!

Mylar Bags, 4 Mil

Mylar Bags, 4 Mil
click for
This item ships free! Your order could ship free!

Why Buy from PHG?

  • Quality, curated product selection
  • Prompt, personal customer service
  • 100% satisfaction guarantee
Accepted credit cards
Canadian orders by phone! Canadian orders by phone
SKU: WK928
  • $1.83 - $139.11
  • In Stock Usually ships in 8-10 business days.


Mylar bags are a special type of metalized vacuum-sealable bag. Just like standard vacuum bags, they have an inner layer of FDA approved food safe polyethelene. The poly layer has a relatively low melting point, so it can be heat-sealed to close the bag air tight. Fused to the outside of the poly layer is a layer of nylon that acts as a strong barrier to oxygen soak-through (a far better barrier than poly). Nylon cannot be heat-sealed, but the duo of poly and nylon is heat-sealable and highly impermeable to oxygen. What distinguishes Mylar bags is a third layer of thin, flexible metal fused to the outside of the nylon layer. This thin metal layer provides the ultimate oxygen barrier. And outside the metal layer is another polymer layer for abrasion resistance. Mylar bags are the best choice for multi-year oxygen-free storage of food (or other goods). They also provide the maximum barrier against moisture and any vapors that may be in the storage environment, including possible fuel vapors. Mylar bags are normally used as liners inside a rugged container (typically a quality plastic bucket) that will protect your goods and the Mylar bag from physical damage (including damage from vermin).


These durable 4 mil thickness Mylar bags are pre-sealed on three sides to form the bag. The 20 x 30 inch bags are sized for use inside either a 5 or 6 gallon bucket, leaving enough bag sticking out the top, to be heat sealed. The 8 x 12 inch bags have a 1-quart capacity. 

  • “Well, I just want to say you guys are terrific! Your prices are great, the products are top of the line, but most importantly to me, the service is perfect. Thanks a bunch!”

    – Dakota, NM

First step: Sealing the bag

Two steps must be taken to protect your food with Mylar bags. One is that you must seal the bag, and the other is that you must get the oxygen out. Sealing the bag can be done with a commercial impulse sealer. That's a machine that fuses the bag mouth shut. A straight impulse sealer does NOT vacuum air out of the bag, it just seals it shut. Commercial impulse sealers are available with wide enough seal bars to span the full 20" width of the large Mylar bags. Another way to seal the bag shut is to use a common household "Seal-a-Meal" type of machine. Those machines are normally used (with smaller bags) to both extract air AND to seal a bag shut. Such home-use vacuum-sealing machines don't have a wide enough opening to extract the air from a 20" wide bag, but they CAN seal such a wide bag opening shut (without air extraction), by using their "seal only" mode and simply sealing multiple connecting bands across the full width of the bag opening. A fairly large home vacuum sealer can seal a 20" wide bag using that method, in just two "bites." It's less convenient than the commercial impulse sealer, but it does offer the advantage of versatility... meaning that when you're not sealing 20" wide Mylar bags, the "Seal-a-Meal" type of machine can be used to seal lots of products (with or without vacuuming out the air) in smaller bags as well as other types of containers. It's an excellent way to greatly extend the fresh taste and nutrient quality of foods on the counter, or in the fridge or freezer, by eliminating the rapid degrading effects of oxygen. (Important clarification: Home-type vacuum sealers, in order to extract air from the bag, require use of plastic bags having an embossed inside surface. BUT if you only want to seal a bag and not use it to extract air, then home-type machines WILL accomplish that sealing function on smooth-surfaced bags like the Mylar bags, that do not have an embossed surface.)

The second step (oxygen removal)

You could spend $8,000 on a huge chamber-style vacuum machine designed to vacuum-extract the contents of a large bucket, and seal the Mylar bag. A much less expensive route, and one that's equally effective, is to simply put one or more oxygen absorber packets into the bag before you seal the bag closed. For small-scale operations, oxygen absorbers are highly economical, reliable and easy to use.

Interestingly... there's a reason why these bags look like Mylar party balloons. It's because they're made of a commercial version of the same material as the balloons. Helium is an extremely tiny atom, even for a gas. In an ordinary latex balloon, a special chemical coating must be added to keep the helium corralled... without that coating, the helium atoms holler "Adios, we're outta here" and zip right out through the balloon's wall, leaving it shriveled and very un-party-like. Whether or not helium contacts your food is irrelevant, because helium is highly inert. But Mylar's ability to stop the passage of even tiny helium atoms is great testimony to its effectiveness against much larger molecules including O2 and H2O!

Did we forget something? If you need more information about this product, please tell us what else you'd like to know with a quick email or live chat!


Select product option(s) from the drop-down menu at top of page to see item-specific specifications here.

Brand Shannon Packaging
Color Silver
Material Polyethylene
BPA Free Yes


Select product option(s) from the drop-down menu at top of page to see item-specific specifications here.


Overall Rating:
Viewing 1 - 10 of 24
  • View:
  • 10
  • 20
  • 50
  • You will never be dissapointed
    By on - Verified Buyer
    The Mylar bags from Pleasant Hill Grain, are fantastic. They are strong, perfect mil they will keep your products stored safely for many years to come. I recommend any thing that Pleasant Hill Grain carries. They are a first rate company. Even if you happen not to like something they have, they'll accept a return. I always know where to go to get a good product and good service. Thanks for all you do PHG, William S.
    3 out of 3 people found this review helpful.  Did you?
  • Have bought many things
    By on - Verified Buyer
    I've bought many things from Pleasant Grain. Mylar bags, sealer, grain mill, different whole grains, sprouting seeds, etc. I have never been disappointed in anything that I have received from them. All products were shipped in timely fashion. Look forward to a long relationship with the company.

    Robyn N
    3 out of 3 people found this review helpful.  Did you?
  • Does what it is supposed to do.
    By on - Verified Buyer
    Good quality, prompt shipping and a fair price.
    2 out of 2 people found this review helpful.  Did you?
  • mylar bags
    By on - Verified Buyer
    ordered, was shipped on time, delivered day was expected. order was correct, and am using many now to store dehydrated foods in.
    1 person found this review helpful.  Did you?
  • Mylar Bags
    By on - Verified Buyer
    Very good quality long term storage bags. Not skimpy at all in size and of decent weight/thickness for durability while handling.
    1 person found this review helpful.  Did you?
  • Good Value
    By on - Verified Buyer
    Good way to store items for extended periodsl
    1 person found this review helpful.  Did you?
  • Good advice
    By on - Verified Buyer
    I received good phone advice and am pleased with my purchase.
    1 person found this review helpful.  Did you?
  • Great product!
    By on - Verified Buyer
    Happy with the size and quality of this product, will definitely buy again.
    1 person found this review helpful.  Did you?
  • great quality and great price
    By on - Verified Buyer
    I always get great value from pleasant hill grain and I never have to pay shipping, just spent 59.00 and its free, I love, Love, Love that. My order always comes fast and the web site is easy to manage. Thank you Pleasant Hill Grain!!!
    1 person found this review helpful.  Did you?
  • Great products, prices, and fast shipping.
    By on - Verified Buyer
    PHG never disappoints. Hadn’t ordered from them in a while but they had exactly the items I wanted in stock, prices were outstanding, packaging was secure, and shipping was fast. Well-run company and will continue to do business with them. Thanks. Jim
    1 person found this review helpful.  Did you?
  1. 1
  2. 2
  3. 3

See product description below.

Return to top
Back to top