Something Wicked This Way Comes
Something bigger is coming...
We've been watching, taking notes. You spoke, FireSak listened, and now we've delivered.
Not just bigger — meaner, smarter, and built with the kind of presence that makes everything else look underbuilt. The new FireSak Goliath is what happens when you take a solid battery storage bag and push it into full heavy-duty territory: 30% thicker material all around, upgraded construction, more usable space, and two exclusive design features that instantly set it apart from the pack.
This is not a basic storage bag. This is the bag you choose when you want serious size, serious structure, and a more dialed-in build, this bag is anything other than ordinary.
The Goliath changes the game
The name is not subtle, and neither is the FireSak.
The FireSak Goliath is the largest FireSak we’ve ever made, measuring 75cm tall, 64cm left to right, and 35cm front to back. That’s a whole new scale of storage, with the kind of proportions that give you room to breathe, organize, and handle larger setups without fighting the bag every time you use it.
But this isn’t just a bigger version of the old design. The Goliath is built with thicker material throughout, giving it a more rugged, robust, hard-use feel from every angle. It looks more serious because it is more serious. This bag is a purpose-built, premium, extremely durable storage solution
VeloFlow, built to stand out
The new VeloFlow Tech.
This is one of the defining features of our Goliath, and it’s the kind of detail that gives the bag its own identity. VeloFlow uses four aluminum vents rings pressed into the lid, creating a distinctive, high-spec look while adding a smart venting design to the top of the bag.
These functional, aesthetically aggressive, vents are exclusive to FireSak. With large scale battery failures each individual cell can produce up to 100 liters of gas in under 1 minute. Without giving that gas somewhere to go, you've just effectively made a large explosive. Venting is a necessary evil that most battery bag manufacturers don't even think about, because they've probably never tested their bags.
If you want something engineered instead of improvised, VeloFlow delivers that immediately.
PyroMesh brings the edge
The other signature feature is PyroMesh.
PyroMesh is a rectangular steel screen riveted into the layers of the bag on the left and right sides. They are designed to act like side vents while still maintaining the bag’s core structure. It adds another layer of technical character to the Goliath and gives the bag a more advanced, more intentional build than standard storage bags.
This one of a kind feature sets FireSak apart. We were the first to dare putting vent holes in our bags which is why the FireSak is considered a premium bag. We tested it, and did things right. The truth is NO battery bag on the market will be able to contain the unfathomable amount of power behind a lithium battery failure. But with our feature implementations, this FireSak is challenging the "impossible".
PyroMesh gives the Goliath a sharper, more industrial identity and reinforces the fact that this bag was designed with actual utility.
Built for hard use
We didn’t stop at size and venting.
The Goliath also includes a mesh side pocket on the exterior for accessory storage, giving you a clean and practical place to keep related items together. That means less clutter, better organization, and a setup that feels more complete from day one.
And because the details matter, the Goliath uses double-stitched "steel wire", para-aramid fiber thread throughout, for added durability and a more reinforced overall build. That’s the kind of construction other bags simply don't have. Other companies are making something that you'll buy, FireSak strives to make products that actually work.
From the material choice, to the stitching and venting design, everything about the Goliath is meant to communicate the same thing: this is the upgraded one.
Why the Goliath matters
The old bags were good.
The Goliath is the one people will remember.
This is what happens when a product line gets the upgrade it deserves: more size, more structure, more refinement, more presence. It’s the bag for people who want their battery storage solution to feel as serious as the gear they’re putting inside it.
If you’ve been waiting for a FireSak with more attitude, more capability, and more premium features, this is it.
Preorder the Goliath
The FireSak Goliath is almost here, and this is your chance to get in early.
If you want the largest and most industrial FireSak ever made, with exclusive VeloFlow,& PyroMesh tech, thicker materials, reinforced stitching, an exterior mesh pocket, and a more rugged overall build, preorder now and be first in line. The Goliath will be replacing the Large size in our lineup. If you have an existing preorder for a Large size FireSak from our last batch, your wait is over. You'll be receiving the Goliath when production is complete.
The Goliath is here, and this bag raises the bar.