Tool Review: Box Sizer – Create the Perfect-Sized Shipping Box

Box Sizer ToolBesides boxes and 3-inch packing tape, the one tool I simply can’t live without in my Amazon FBA business is a box sizer. I use this tool almost every time I’m packing up an Amazon FBA shipment. Not only does it save me time, but it also saves me money. I’ll break down exactly how in this article.

I don’t know how many times I’ve packed up a box with Amazon FBA inventory only to realize that the box is not completely full. Sometimes all I need to do is add a little dunnage to the box so that none of the items in the box move around during the shipment, but other times, there is so much space left in the box that I end up wishing I had a smaller box. Well, the box sizer tool grants my wish!

The box sizer tool helps transform my big shipping box into a smaller box. It’s an easy-to-use tool that adjusts the size of my box in order to reduce any excess space. Not only can my boxes be modified to the perfect size, but there is also less “air space” that needs to be filled up by excess dunnage. My shipping boxes end up smaller in size, weighing less, and costing less in Amazon or UPS fees.

Before we go on, let me share with you a video of the box sizer tool in action:

By combining the box sizer tool with the Black & Decker electronic scissors, I’m able to easily adjust my shipping boxes to be the perfect size for my Amazon FBA shipments.

515LRZn2AuL._SL1000_Since UPS charges dimensional weight fees (through Amazon) for the boxes I ship to FBA warehouses, then I always want to make sure I’m using the smallest boxes possible. It’s not really realistic to have the perfect box sizes on hand, so I can save the time searching for the perfect box size and just make my own with this easy tool. With the money I saved from no longer sending in only 18x18x16 boxes to Amazon, this tool paid for itself within the first few times I used it.

But the box sizer tool is not just for making boxes smaller… it can also be used to make a box bigger. You might be thinking: “WHAT?!?!? How is that even possible?” Let me show you:

As long as I have a little extra cardboard on hard, I can use this tool to make my shipping boxes larger. This also can be a time saver. Before I had the box sizer, I don’t know how many times I had packed up a box only to wish I had just a little more room to fit more inventory. Now that I know how to use the box sizer tool to make the boxes bigger, there’s no more rushing to the store to try and find a larger box. Now I can just make a bigger box in less than a minute.

31YliKNB3LL._SY355_Again, with the time and money this tool saves me, it is easily one of my top tools that I use in my Amazon FBA business. I really wish I had the box sizer tool and Black & Decker electronic scissors when I first started selling on Amazon.

So how about you? Do you own or use a box sizer tool? Have you found any other ways to use it that could help everyone? Feel free to share below!

19 responses to “Tool Review: Box Sizer – Create the Perfect-Sized Shipping Box

  1. I was slow to buy one of these when I first started. After I bought one I wish I would have bought it sooner. It is a “must have” in my office.

  2. I typically ship around 30 items (that is the number of labels per sheet I print) of board games and misc. stuff at a time in the $1.88 Walmart large moving box size 18 X 18 X 24. The weight is usually 30 some odd pounds and cost $7 -$8 when shipped to closest FBA warehouse. I’m thinking it is cheapest to ship everything in one box this size rather than several smaller boxes. Am I wrong? I think I read somewhere that there is a 50 pound weight limit then price spikes. Is that true? The resizer will be helpful when I can’t fill a box. I appreciate your helpful video demo. I had heard of using one but didn’t know how it worked. Thank you.

    • I don’t know if the price “spikes” when above 50lbs, but it is in Amazon’s rules that any box over 50lbs needs to be labeled as “heavy” or 50lb+”

  3. Nice videos Stephen! I have the box resizer and like it for the reasons you mentioned. But I’d never seen those bomb-diggity electric scissors. Must put those on my wish list now 🙂

  4. Debbie polachek

    This is a wonderful tool.
    Thanks for all your interest in helping us all.

  5. FYI – the formula UPS uses for dimensional weight is L x W x H / 166. Compare the dimensional weight to the actual weight, and you’re billed for whichever number is greater. Taking an inch or two off of box height can make a big difference in shipping charges over time.

    Here’s a link to the UPS help page:

  6. Holding a metal straight edge (such as a carpenter’s square or sturdy metal ruler) against the line the cutting edge of the box resizer makes as you fold the cardboard over makes for a much straighter and stronger corner.

  7. I have to give credit to you this is a very cool tip. Lots of money is wasted not paying attention to dimensional weight.

  8. Thank you for these tips!!!

  9. Thanks Emily for your enlightening comment. I learned something. Thank you.

  10. Stephen, great post…those are two tools I think I’ll need to get. One question for you…early in this post you mention 3″ packing tape. Would you mind recommending exactly which one you use? How is it dispensed…tape gun?

  11. Thanks for the videos Stephen. I didn’t think I’d really use a box sizer that much, that was until I got it and tried it. Had it for while now and love it! Never thought of using it to make boxes “bigger” though. That is a great tip that I will definitely be using in the future. I use a Black and Decker Cutting tool instead of the scissors (didn’t know they made those) which is great and way better than using a box cutter, but can be a little difficult at times to use because of the way it’s made. Will be purchasing the B&D scissors next!

  12. Sometimes I run into a issue where I have a bunch of items but then Amazon wants me to send 1 or 2 items out of the whole bunch to a different warehouse. How do you handle this situation?

  13. Here’s an added tip for you Stephen….when making your boxes smaller cut off some of the extra cardboard (while still making sure it closes). It’ll weigh less. At times it may not matter but then other times it could put you in a whole new weight category! Use those extra pieces for when you need them. 🙂

  14. OMG, this is so uber-cool!! I’ve been on online retailer for 15 years, and I still remember the Christmas the UPS guy had to wait for me one day while I built a box by hand.

  15. I every time spent my half an hour to resad this weblog’s articles or reviews all the time along with a mug of coffee.

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