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 Anti-theft portable safe
Flak Sack II Anti-theft Back
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 Sale price $129.00 USD Save $40.00 USD
77 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.

  • 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. Fabric made in the USA.  Manufactured in China.
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 446 Reviews
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Sandra F.
United States United States

Does what it says!

Our belongings were secure in the Middle East in public places and on our backs. It’s a bit of a hassle to open and close, though. Especially at first when it’s still stiff. My only recommendation would be to add a small outside pocket. Maybe on the side that would be against my back. It would be nice to have faster access to important but easily replaced items such as lip balm or sunscreen.

United States United States

Safety First

Traveled to Estonia and Latvia recently and wasn’t concerned about my personal stuff being stolen from my Flak Sack II. In crowded areas felt that the security of the locked bag a great hindrance to the thieves.

Byron L.
United States United States

Awesome Bag...peace of mind

I am so glad I ordered this bag...I've always been wanting a bag that I can secure while I quickly step.out to do something like use the restroom or when I go to the park or beach, to secure my belongings somewhere. It definitely gives me more peace of mind. I've already got asked where I got it while out and about. . Great customer service too.

Devin H.
United States United States

Excellent Prodcut

I absolutely love this product. I bought three Flack Sack II (one for myself, one for my cousin who is a freshman in college and one for my cousin who is in high school.) I use this bag for my work travels and it fits my Lenovo Yoga 920 with no problem and I love the peace of mind I get from this bag when traveling. I recently purchased the Antitheft Sack 3L for those days when I'm at a beach or hotel pool, etc. and only need to carry my phone, wallet and car keys. I'm very impressed with the quality and enjoy these bags!

Nanci R.
United States United States

Nice bag overall

The bag looks durable and visually appealing. I have 2 issues with the bag. For me, it was very hard to cinch the bag closed to get the eyelets exposed to look it and it is heavier than I expected. Overall, I would recommend it.