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
551 reviews
96 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.

You may also like

Customer Reviews
4.8 Based on 551 Reviews
Write a Review

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
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
Nicole C.
United States United States
Worth it

I have had my eye on this bag for a long time before I was gifted it by my mom who wanted me to have a safe bag to walk around downtown (my new job location) with and I can’t wait to take it on vacations too! My only complaint is my own fault. I wish the lock had an easier way to get into it if you forget the combo. Again this is MY fault lol. I am forgetful and thought I would remember and didn’t and now the lock is stuck on the bag and I don’t know what to do with it or how to get it off. I need a new lock already lol Anyways great bag!!! Worth every penny

Brian H.
United States United States
Great bag wish it was a little bigger

Bought it for my nephew for Christmas. He’s in college but with his MacBook in it it doesn’t leave much room for books and such. Otherwise great quality build, oh well

Paul B.
Australia Australia
Travelling Europe

Been very happy with the bag especially travelling with carry on only, it has been classed as my plus one personal item the whole way. Good to know everything I have in there is secure. Thank you very much for this produce.

United States United States
Great Secure Bag

The Flak Sack II looks like it will be very useful on our Caribbean Vacation in January. There is plenty of room for our valuables and some other items. It is well made and supper strong. Some reviewes had concerns with the lock, mine works good, it might be the new and improved type. I tried it many times.