The Flak Sack™ by the Loctote® Industrial Bag Co. is the toughest drawstring backpack ever. Made with a double layer of heavy-duty slash-resistant fabric, it’s like a portable safe for your valuables. It 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.  Simply lock the bag closed or to any secure object – and leave it without worrying about it being tampered with or stolen. This bag doesn’t just carry your belongings, it protects them. Lock included.

Color: Steel Grey – Midnight Black Ropes

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SKU: 21228


Flak Sack 


Your bag shouldn’t just carry your belongings, it should protect them.  

This is the bag that everybody, at some point in their life, wishes they had.  Elegant in its simplicity and unapologetic in its brutal effectiveness. Sometimes you just need a safe place to put your personal items and valuables while you focus on something else. Our purpose for creating this bag really is that simple.

When you start with a blank sheet of paper you get to re-think everything. That’s what we did with this bag. We considered the best way and the best materials each step along the way. We purposefully over-engineered, over-designed, and over-built. Nothing was left to chance, and in the end we created a product that is functional, packed with features and built to last.

We thought through everything and skimped on nothing. We did things to test our bags that didn’t make our moms proud (and possibly violated a few city ordinances). Good enough wasn’t good enough. We saw beauty in strength and elegance in simplicity. We got in touch with our softer side, and we kept innovating until we got it right. At the end of it all, we created a product that we think will blow your mind.






Slash Resistant


RFID Blocking


Sternum Strap


Water Resistant


Lifestyle Ready

Lock It & Leave It


Pull it, lock it and leave it. It’s that simple. The patent-pending steel reinforced locking strap and heavy-duty solid brass lock enable you to lock your bag shut, and to a fixed object — making it virtually impossible to pilfer or steal without extreme force or heavy tools.

Incredibly Tough


Crafted from a double layer of a proprietary blend of ultra high molecular weight polyethylene (UHMWPE) and other state-of-the-art fibers, this bag attains the highest possible slash, tear, and abrasion resistance ratings (Level 5). The fabric was originally developed for use in high-performance body armor and personal protection gear.

Prevent Digital Pickpocketing 


Protect against RFID theft & electronic pick-pocketing. Our bags include a large internal pocket lined with a certified RFID blocking material to effectively shield contactless credit cards, passports, smart cards and key cards from unauthorized scanning.

Keep Your Stuff Safe & Dry


Sh*t happens! Rain, spills, splashes, puddles, high-tide, and general carelessness are the enemy of your small electronic devices and leather goods. Each LOCTOTE® bag is treated with an industrial water and stain repellant coating, and comes equipped with a large (capable of holding an iPad Mini) water-resistant interior pocket.

Security & Comfort


Our leather sternum strap gives you that extra bit of security and comfort. By keeping the ropes centered across your chest, the Flak Sack™ stays secure with its weight comfortably distributed across your shoulders.  It’s there when you need it, and removable when you don’t want it hanging around.

The Everyday Bag


This is the bag you’ll want to take with you everywhere. Lightweight, comfortable to carry, foldable, packable, crushable, UV resistant, latex and gluten free. Whether you’re dressed for the office, the gym, the beach, or a night out — LOCTOTE® bags are a soft reliable friend that will protect your stuff from thieves, and you from bland accessories.


Dimensions: 18” x 14” (fits Macbook Pro 15 inch)

Capacity: 13 litres

Weight:  1.4 lbs without lock (lock is 3.8 ounces)

Interior Pocket: 10” x 7.5” (can fit an iPad Mini)

Source: Designed in Columbus, Ohio. Manufactured in China.

Care Instructions: Hand wash in warm or cold water using mild detergent. Pat dry with a towel and air dry. Do not tumble dry, bleach, or iron. For best results give it to your mom. She’ll know what to do.



Domestic Shipping – Domestic orders are shipped via FedEx. Shipping is free on all domestic orders and delivery takes generally 4-7 days (Hawaii and Alaska may take longer). Once processed, orders go out the next business day unless the item is on back order. Tracking numbers are provided via email at the time of shipping.

International Shipping – International orders are shipped via FedEx. Shipping cost is a flat $10 per bag on all international orders. Delivery generally takes approx. 5-9 days depending on location. Once processed, orders go out the next business day unless the item is on back order. Tracking numbers are provided via email at the time of shipping.  We work hard to keep our shipping rates reasonable while ensuring your items are delivered in the most efficient and reliable way possible. International shipments may require additional duties and taxes to be paid by the buyer. Check with your local FedEx or customs office to find out more information.

If you have any questions, feel free to contact us.


We want you to be completely happy with your purchase. If for any reason you are not satisfied with any item purchased directly from this website, please return the item to us within 30 days of purchase in its original condition for an exchange, or refund in the original form of payment. All merchandise must be in new and unused condition. For international customers, return shipping costs are the responsibility of the customer, unless the product was damaged/defective when you received it.


All LOCTOTE® products purchased directly from this website are warranted to be free from defects in material and workmanship for one year from the date of original purchase. This warranty does not cover intentional damage, accidental damage, damage resulting from unreasonable use, normal wear and tear, improper handling, damage caused by a common carrier, loss of use, or other consequential damages. If a defect is found in materials or workmanship, please feel free to contact us for instructions and authorization to send the defective product to us. Products that cannot be repaired to our standards will be replaced with a new one. We will cover the costs associated with shipping the defective product to us.

We accept no liability for any actual, consequential, or incidental damages or losses incurred as a result of using a LOCTOTE® product. Though we are confident that we produce the best and most secure products available, we cannot control how they are used, the situations and circumstances in which they are used, or the forces and abuses to which they may be subjected.

Why Flak Sack

Beware of knock-off Flak Sacks! We invented it. We continue to improve it, and we’re a real company that won’t ignore you after the sale.


  • Made from a double (not single) layer of perpendicularly-aligned advanced cut-resistant fabric – more than twice the strength and cut resistance
  • Locking strap made with with military-grade brass grommets physically integrated into a patent pending custom machined stainless steel and aircraft cable internal mechanism – will not tear out
  • Custom-made solid brass lock (3x the weight of a competitors flimsy lock) for superior strength
  • 20% larger
  • Internal pocket lined with micro-fleece and shielded with a certified RFID-blocking material
  • Entire bag treated for water and stain repellency (not just a small internal flap pocket)
  • Super-soft and flexible heavy-duty 8mm nylon-core cut-resistant ropes
  • Special military-grade #4 brass grommets set using a patent pending method will not pull out like other bags can (can withstand over 10x the force of other bags)
  • Separate rope and lock strap channels prevent tangling
  • Precision design and tight manufacturing tolerances means the bag closes tighter (4x smaller at the opening) than competitors
  • Heavy-duty 5mm stainless “O” ring cannot be snipped with simple hand tools and has over 2,000 lbs breaking strength.
  • Patent pending multi-loop makes it convenient to hang or attach the bag to other items, and can be used to provide an extra level of security.
  • Exterior pocket (leather) provides a place to store the lock, and prevents it from banging or damaging surrounding things
  • Matching (leather) removable sternum clip