Flak Sack II
Flak Sack II
Flak Sack II
Flak Sack II
Flak Sack II
Flak Sack II
Flak Sack II
Flak Sack II
Flak Sack II
Flak Sack II
Flak Sack II
Flak Sack II
Flak Sack II

Flak Sack II

Regular price $169.00 USD Save $0.00 USD
544 Reviews

The Flak Sack II is the world's toughest theft-resistant drawstring backpack. It's a backpack & a portable safe, all-in-one. Made from Flaknit, our virtually slash-proof fabric that achieves an A9 cut level, the highest there is! This lockable bag 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. This bag doesn't just carry your belongings, it protects them.

  • Flaknit™ virtually slash-proof fabric achieves A9 cut level, the highest there is for slash, tear, abrasion resistance.

  • Patented double steel reinforced locking strap & heavy-duty combination lock allow you to lock the bag shut, and to a fixed object.

  • Cut resistant ropes prevent strap slashing

  • Large fleece lined interior RFID blocking pocket shields unauthorized scanning

  • Sternum Strap keeps ropes centered across chest 
    • 18" x 14" (fits Macbook Pro 13 inch)

    • Capacity: 13 litres

    • 2 lbs (includes lock)

    • Interior Pocket: 10" x 8" (can fit an iPad Mini)

    • Natural leather patch & accents

    • Designed in Columbus. Manufactured in China. Proprietary fabric design & developed in the USA.
This item is available and will ship the next business day from the purchase of date. We offer FREE standard domestic US shipping on orders over $75 and have Express & Worldwide shipping options available. We use FedEx and USPS (US Postal Service) as our shipping carriers. For international orders, any taxes, duties, or customs fees owed are the responsibility of the customer. Please be aware of your country's customs duties before purchasing. Shipping costs are non-refundable.

Flak Sack II

The World's Toughest Theft-Resistant Drawstring Backpack



We scour the globe to find the  best and most technologically advanced materials and manufacturers available. We compromise on nothing when it comes to quality and authenticity, and cut no corners in crafting goods built to outlive their owners.

slash-proof (a9 cut level)


Our slash-proof toughness comes from the superior cut protection of Honeywell's UHMWPE Spectra fiber, the same fiber used in police vests and military gear for bullet resistance. Have peace of mind knowing your belongings are covered by this stuff.



The steel reinforced locking strap and heavy-duty solid brass lock enable you to lock your sack shut, and to a fixed object. It's nearly impossible to cut, break or tear without extreme force or heavy tools.


Lock machined from a single chunk of solid brass to ensure the security and durability of the lock. Easily set the lock to any combination you would like.


Made with a cut resistant core interwoven with a highly-reflective material for night visibility. Even though we hope no thief ever tries to cut this bag off your back, it’s nice to know they won’t be successful.


Protect against RFID electronic pick-pocketing. This sack has an internal pocket lined with a certified RFID blocking material to shield credit cards & passports from unauthorized scanning.


Our bags are lined with a water resistant nylon lining and is equipped with a large (capable of holding an iPad) water-resistant interior pocket crafted with an Aquaguard zipper to keep your stuff as dry as possible.


Gives you that extra security and comfort. By keeping the ropes centered across your chest, the bags stay secure with its weight comfortably distributed across your shoulders.


Traveling to an unknown place, doing your daily commute, hanging by the beach or just find yourself in a busy place, the Flak Sack II is ready for the challenge. This bag is the ultimate portable safe that allows you to live more & worry less.

Customer Reviews

4.8 Based on 544 Reviews
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Josh C.
United States United States

International security

Traveling through Europe, battling huge crowds and busy transportation ports can be stressful. The fact is this bag has allowed me to have comfort that pickpockets don't have easy access to valuables. Not to mention that I've been able to completely secure my money and passport in the numerous places I've stayed during this trip. This mini fortress is worth every penny, especially when considering that the quality of it gives me confidence it will survive longer than I will!

Josh C. verified customer review of Flak Sack IIJosh C. verified customer review of Flak Sack II
United States United States

Cruise use

Work great on cruise to secure personal items and maintain chosen location when departing chairs for short visits for dining, pool use, getting beverages, or use of bathroom facilities. We were able to lock our flak sack II containing books, Fire tablets, cash and other possessions to arms between my wife and my chosen deck chairs when we needed to leave for short periods. I know it is not well received to leave items on deck chairs and then leave for long periods of time curtailing use of chairs for others sometimes for hours on end, but the use of the flak Sack II as previously stated for short periods allows you to leave with peace of mind that your personal items and chairs/loungers will be in the same status as when you left. Well worth the cost for this purpose alone with all the others uses available are icing on the cake. Great product in today's world.

United States United States

Great gift

Bought this for a young man as a graduation gift. I was impressed at how the item was packaged beginning with the outside box, cloth storage sack & informational insert. The attention to detail is remarkable in today’s world of Amazon shopping. The detail, hand-crafting & care of the product shows from the moment it arrives.

Anonymous verified customer review of Flak Sack IIAnonymous verified customer review of Flak Sack II
Tanja S.
Canada Canada

Flak sack

Haven5 used the item for our trip yet, but very impressed with the quality and fast shipping!

Stacey M.
United States United States

Love My Sak

We really love these bags. When we go to basketball games we secure the bags to the pole in front of us and watch the game without worry. Great investment