Rated 4.94 out of 5 based on 17 customer ratings
(17 customer reviews)


Large Sized Zippered Diagnostic Bag

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“I love the MB3. I can fit my Testo digital manifold, full set of hoses, temp clamps, a full set of Testo smart probes, core removal tools, and all my miscellaneous refrigerator tools.” -Ryan S. (HVAC)


The MB3 is a large meter bag capable of storing, transporting & protecting large meters. The main bay is designed for digital manifolds, meters up to 13.5”(34cm) tall and/or a few select hand tools.



  • Height (H): 14” (35.5cm)
  • Width (W): 11" (28cm)
  • Depth (D): 5" (12.5cm)
  • Weight (empty): 2.3lbs/1.1kg
  • Internal Volume: 270 in3/ 4.5L
  • Max Payload: 25lbs/11kg


  • Large main pocket with 2 padded interior pockets ideal for protecting 1 - 4 meters
  • 13 available pockets ideal for wireless probes and small small hand tools
  • Tarpaulin covered rear pocket for added weather & abrasion protection
  • Ruggedized reinforced bottom
  • Detachable over-sized elastomeric carrying handle
  • Electrical tape strap
  • YKK® zippered pockets


  • Warranty: 5 Years (see Veto warranty terms and conditions)

Additional Information


Keep the Zippers Clean & Lubricated

Over time, dirt and grit will “clog” the zipper coils preventing them from staying closed. To keep this from happening, clean and lubricate your zippers twice a year (more often if you work on a job site with a high amount of airborne debris). To clean the coils: Scrub them with soapy water; a tooth brush works very well. After scrubbing the coils, blow them out with an air hose to dislodge any other fine grit that didn’t dislodge with the brush. To lubricate the coils: Apply a silicone spray, beeswax or a zipper lubricant.

Protect the Zippers From Sharp Objects and/or Excessive Heat

Any sharp object or heat source is capable of permanently damaging the zippers. Once a zipper coil is cut or singed the zipper will not function and in most cases is not repairable. Most of the cut zipper coils we see are the result of sharp tools stored inside the bag with the sharp side facing up. Make sure to keep the sharp edges of your tools facing down in your bag and away from the zipper coils.

Don’t Overstuff the Bag

Overstuffing your tool bag will very likely cause significant stress on the zippers that is above and beyond what the bag was built for and will eventually cause the zipper(s) to separate. If you have to work hard to close your zipper(s), your tool bag is most likely overstuffed… proceed with caution!

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17 reviews for MB3

  1. Rated 5 out of 5


    Really like this bag. Lightweight and durable, fits all I need.

  2. Rated 5 out of 5


    Great beginner’s bag for HVAC…

  3. Rated 5 out of 5


    Great bag, I use it for my diagnostic bag. Keeps me light but holds everything I need. Had to get something tall to hold the fieldpiece sc680, love the meter but it is huge. Fits great in this bag and it holds all my other essential tools, a set of stubbies and my manometer. Great quality and I would definitely recommend.

  4. Rated 5 out of 5

    S.flynn91 (verified owner)

    I have had this bag for 3 years now and i use it daily. It’s able to hold all the tools I need to do most jobs. The bag has taken a lot of beatings over the years and there is nothing wrong with it. A few of my co workers have bought this bag cause of me and they love it too.

  5. Rated 5 out of 5


    I use this bag as my everyday HVAC maintenance/service bag. It holds everything I need for maintenance and diagnostics minus my drill. I carry 3 meters in the large pocket, monometer, amp meter and a Fluke 116. This is my first Veto bag and have only had the bag for a few weeks. That being said I love the durability and storage options. I will be buying another Veto bag after seeing first hand how well this one is working for my everyday bag.
    Not all is perfect for me personally as I would have liked an over the shoulder strap to be included but that’s not a knock on the quality of the bag and not enough to warrant giving this product less than 5 stars.

  6. Rated 4 out of 5


    This is a great bag for the price. I work as an hvac tech and I use this bag to hold my drill, drill bits, meter, and a few other miscellaneous tools that I use daily. My one complaint, and the only reason I’m not giving this bag 5 stars, is with one of the small side pockets meant for pliers. I rope this bag up onto the roof, and in one of the side pockets I keep a pair of wire strippers which fit perfectly. Sometimes, when the bag is on the ground and I am on the roof attempting to hook onto the bag, it falls over and the wire strippers fall out. They seem to fall out every time the bag gets tipped over. It would be nice if there were a nylon strap with either a velcro or snap style closure to keep the tool from falling out. Other than that the bag is holding up perfectly and is built with high quality materials. I can tell this bag is going to stand up to the abuse that put my tools through on a daily basis and wouldn’t trust any other brand to compete.

  7. Rated 5 out of 5

    BWulf79 (verified owner)

    HVAC Application
    Love this bag, I own many veto bags, and have uses for each of them. The MB3 is not too larger nor too small. I’m able to carry my Fieldpiece wireless JL3PC clamp(s), JL3PR pressure probes, JL3RH air temp sensor(s), JL3KM3 manometer, SPK3 folding IR Thermometer, SC680 Clamp multimeter, along with all necessary hand tools, core tools, jumpers. Perfect bag for my use and trade. This is my everyday go bag

  8. Rated 5 out of 5


    Great small tool pack. I am currently an HVAC student in trade school and recieved this pack from Veto’s trade student program. It is great for the amount of tools that I use in our HVAC lab. Veto pro pac will be the first store I look at when purchasing a larger bag when I enter field work.

  9. Rated 5 out of 5


    I’ve only had the bag in the field a few weeks but before i was carrying my gauges and accessories in a large har case hich was a pain in the rear. I spotted this bag and when i was looking through the pictures my guage set is what in the picture so i was excited to say the least i knew it would work to condense all of what was in the hard case to this bag i haven’t quite filled it with everything i need in it yet because tools are expensive as hell.

  10. Rated 5 out of 5


    Great little bag! I use it for diagnostics. It houses my Testo 557s gauges, hoses, and all my probes. There’s still room for a 11 in 1, pump pliers, 2 adjustable, service wrench, some drill driver bits, and my meter.

  11. Rated 5 out of 5


    I love this bag. SUPER high quality.

  12. Rated 5 out of 5


    The MB3 is a perfect choice for an AC and Refrigeration service setup. This bag could just as easily become any trades persons everyday service bag. The rear pocket is perfect for storage of my Testo digital probes and temperature clamps. The durable on the pocket flap material protects your digital probe equipment from from any abrasions during transport. The main pocket provides ample room for some tools or a couple large multimeters if needed. I keep a Wera maintenance kit with VDE drivers and a 1/4” ratcheting zyklop tool with SAE sockets as well as a clamp meter and iPad in the main pocket. The front flap pocket houses some wrenches with the clear view parts pocket holding some fittings and other small AC/Refrigeration associated items. If a smaller service bag is what your looking for, then this is a great option.

  13. Rated 5 out of 5

    Jacob Wilson (verified owner)

    Toughest bag I’ve had yet. Veto knocks it out of the park so far with every product I’ve used so far.
    I started with the mb. I was so blown away with the quality performance and craftsmanship. Now I have and use the mb mb2 mb3 mb3b and the tec backpack. I work on overhead cranes in some of the toughest environments. From steel mill melt shops to annealing lines with acid liquid and powder. To outside in snow and ice to over 250degree cranes in melt shops. And all their products stand up against the different environments. Dirt dust grease all of it.
    It nice to have a bag that can withstand and carry the weight of a lot of tools. And keep them clean. And saves me a lot of trips up and down since I have everything I need in them. People ask me about them all the time. Only issue I had was my fault when I jammed a spud wrench in a bag and tried to zip it I broke the zipper. And contacted veto and they 100% backed their no downtime warranty. Sent me a new bag and covered shipping to send the broken one back to them. They weren’t cost effectively able to repair it so they gave me a brand new bag. You can’t find service like that anywhere.
    I would definitely recommend veto pro pac to anyone looking for the best tool bag that will last a long time.
    Thank you for making a quality product and backing it with superior customer service.

  14. Rated 5 out of 5

    Paul Miller

    Great quality bag for meter and tools.

  15. Rated 5 out of 5


    fantastic product, very robust and compact. would recommend to anyone who need a small back for testing work.

  16. Rated 5 out of 5


    I’ve had this tool bag about a month now, I receive this free from the spring promotion. This tool bag is a little smaller than the one I purchased . Their materials, stitching, and construction are really great. The bag is very well laid out with plenty of pockets. . I’m sure I’ll get many years of trouble-free service. But if there is a problem in the future, I will definitely purchase another Veto tool bag.

  17. Rated 5 out of 5


    This is best bag design bar none, I store my Testo 557’s manifold in the main pouch, with plenty of room to spare, with 3 wireless probes, my investment is well protected, and this bag is stored in the bottom compartment of my fluke backpack with all hoses meters and tools

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