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 Locked Bag
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
1796 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 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

Based on 363 reviews
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Daniel M.
United States

I travel a lot and

I travel a lot and this bag may be the solution to many situations I usually find myself in. This bag so far has really come through with what was described to me. I imagine there would be some cosmetic damage that I would be upset with if someone would try to steal from it, but I am very confident that the thieves would be a lot more disappointed. It is not bad looking and the design is precise where security may not dull after a few years. Only one doubt I may have is if the small lock would survive some beating, but of course most thieves may not expect any lock on a small bag so they would have to know the bag and prepare for the lock.

Matthew M.

Great bag, hopefully the stitched seams don't fray.

I am a huge fan of the bag. I like the size and convenience. This bag is really a replacement for the original flak sack that I bought. I had not even used that one once and it frayed and had some problems. The team ad Loctote was great to deal with and helped me with returning and replacing my item.

Steven G.
United States

Better Than Imagined...

Reading about my options on your website was a breeze as was making a fully-informed decision when ordering. I received my awesome bag in what seemed like no time, and was very pleasantly surprised upon opening my package. The hand-crafted quality and durability was pretty close to astounding! I was very impressed with everything including how every detail was so well thought out. This little gem should last me a lifetime and keep my valuables well protected as I travel throughout SE Asia. Thank you so much!

Danny M.
United States

Awesome Bag Exceeded my High Expecations

I had very high expectations for this bag before I made the purchase (to be used at a beach resort). Once I received it, I was even more impressed with the quality and features. If you've been thinking about buying this bag, so thinking and buy it ... You won't be disappointed.

United States

Live in Scam Francisco

Best bag to have an ease of mind from the bums on the train and bus. Fits all of my essentials, even a large water bottle that I wasn’t expeLock iiit up when walking around the city or going to