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Flak Sack


The Flak Sack™ by the Loctote® Industrial Bag Co. is the toughest drawstring backpack ever. Made with a double layer of heavy-duty slash-resistant fabric, this lockable bag is like a portable safe for your valuables. It was designed to accommodate the lifestyles of people on the go who need their essentials with them, but are not able to be constantly looking after them.  Simply lock the bag closed or to any secure object – and leave it without worrying about it being tampered with or stolen. This bag doesn’t just carry your belongings, it protects them.

    • Double Layer of UHMWPE fabric that's extremely slash, abrasion & tear resistant
    • Patent-pending steel reinforced locking strap
    • Heavy-duty solid brass lock
    • Water Resistant Coating
    • RFID Blocking Interior Pocket
    • Secure Sternum Strap


This is the bag that everybody, at some point in their life, wishes they had.  Elegant in its simplicity and unapologetic in its brutal effectiveness. Sometimes you just need a safe place to put your personal items and valuables while you focus on something else. Our purpose for creating this bag really is that simple.

When you start with a blank sheet of paper you get to re-think everything. That’s what we did with this bag. We considered the best way and the best materials each step along the way. We did things to test our bags that didn’t make our moms proud (and possibly violated a few city ordinances). Good enough wasn’t good enough. We saw beauty in strength and elegance in simplicity. We got in touch with our softer side, and we kept innovating until we got it right. At the end of it all, we created a product that we think will blow your mind. 

Customer Reviews

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  • Reviews (224)

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antonio p.


Good product and good service

Jessica A.
United States

Better than expected

When I saw videos on the Flak Sack online I thought it would be lighter, but it’s tough! I can tell it was made with care, I couldn’t be happier with it and can’t wait to use it at my next music festival.

United States

Peace of Mind

A friend had this bag as we traveled Europe. There were times we went swimming and wanted to make sure our valuables were secured. I would always ask if I could put my wallet and my phone in their Loctote bag. Because of them, I had to buy one for myself.

Corey M.
United Kingdom

Love it!

I bought the original FlakSack for its basic design and it really does what it says on the tin! Very pleased and will look forward to future products.


Bad Situation Made Better

Hello, I recently received my Flak Sack and was having issues getting one of the metal grommets out from inside the bag. After some pulling back the edge I saw that the grommet cord was sewn into the side of the bag and unable to fully exit the hole. I reached out to Loctote and had a fix very quick. A new bag was sent my way within 4 days and now I can say I love the product! I was pretty upset when the bag didn't perform as I thought but loved how the situation was handled and I walked away a happy customer! 5/5 definitely would recommend.

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