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Q&A

Comments on How to cut and seal backpack straps?

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How to cut and seal backpack straps?

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My backpack has straps that are way too long and I would like to shorten them, both to save weight and to make it more organized.

How can I cut the straps and then seal them so the ends don't come unraveled, and should I sew them back to itself before sealing?

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General comments (2 comments)
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I'll echo what Sigma has said: the best way to do this is heat, by one application or another. If you know someone who climbs or otherwise works with ropes, talk to them - they may well know of some good ways to cut ropes cleanly that would work on webbing too.

I work for an outdoors adventure company, and the tool we use for cutting ropes is a small Dremel Versatip butane torch with a blade attachment:

Dremel Versatip butane torch with blade attachment

(That image has the soldering tip attachment on it, but you can imagine a small blade attachment instead.)

If you're not likely to use it more than once, that might not be worth the expense for you, but there's also a cheaper alternative: an old butter knife you don't mind destroying, and a lighter to heat the blade up.

I wouldn't recommend trying to sew the strap to hold it together: webbing is tough stuff and anything short of a sailmaker's needle will just stab you rather than the webbing. Even most machines short of industrial models aren't set up to handle that kind of material.

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General comments (3 comments)
General comments
Sigma‭ wrote almost 4 years ago

I wonder where the line is for that on the coarseness of the webbing. I've done a lot of sewing with an ordinary machine on straps and can only think of two cases where I broke a needle, both where I was working with several layers of heavy fabric along with the webbing. I'd be concerned that continued exposure on the sealed end would eventually lead to the melted portions cracking and fraying anyway.

Sigma‭ wrote almost 4 years ago

Additionally this could cause an issue of the adjusting buckles coming unthreaded because there is no stop loop at the end of the strap, but that depends on the size / tightness of the buckle relative to the webbing, so maybe not an issue.

ArtOfCode‭ wrote almost 4 years ago

@Sigma heat-sealed ends are the industry standard way of cutting ropes to length - as long as you make a reasonably quick cut at high temperature, your seal will remain reasonably flexible, so you don't get any cracking within the lifetime of the rope.