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
586 reviews
862 in stock

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  as our shipping carrier. 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.

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Customer Reviews
4.8 Based on 586 Reviews
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Filter Reviews:
Ismael R.
United States United States
Birthday Gift

This was purchased as a birthday gift for my son. He is a multi sport athlete and D1 candidate. He is always on the move competing or training. This Flak Sak II was the perfect bag to secure his keys, wallet and cellphone. He is very pleased! Highly recommended!

United States United States
Terrific bag

Excellent. Brings peace of mind

Rich M.
United States United States
I Absolutely Love The Flak Sak II

I am so happy with my purchase. Though the price gave me pause, I moved forward with my purchase because of all the features. I am so glad I did purchase the Flak Sak II. It is stylish, extremely well made and loaded with features. I especially love the sternum strap. Genius! Highly recommended!!