Source for dense/stiff 1/8” closed cell foam?

This is what I bought. Shipping is almost as as much as the cost of the foam, but a 30×72 sheet will do a lot of DIY projects for around $20+. I haven’t had a chance to use it yet. Maybe others can chime in on a tried and true source. This might not be stiff enough for you.

https://foamforyou.com/2lbs-minicell-foam.html

Have you considered harvesting it out of other backpacks? My local thrift shops have bins full of backpacks, purses, computer bags etc.

Stiffness of foam is often linked to its density, which is defined by a pound weight. For instance the link a couple of posts above shows a 2 lbs foam, which is the typical soft stuff used in most manufacturer’s belts and shoulder straps, ie not stiff at all.

For any real change in stiffness one needs to go to 6 lbs and beyond. Like this

While it says ‘super high density’ in the auction title it is really just moderately stiff, but I still found it very useful for dual density hip belts and such.

I have ordered 12 lbs density 1/8″ foam from a company called Flex Tech (which btw is also one of the few placed I have been able to source true EvaZote), and that weight class is really stiff.

Recycling foam (and fabric, and hardware) is a good idea.   I was also going to say auto upholstery foam.  I have some similar stuff, also found on ebay.  But it makes me wonder if you could harvest large quantities of it from a junk yard.

Thanks for the responses everyone. It’s helpful to understand the different weights so I know what to look for.

My last pack project I was able to pilfer a plastic frame sheet from an old pack but I’m out of old packs now. Good idea to check the thrift store.

1/4 inch is what I use on my packs, belt and shoulder straps.  this is a small company by good service.

https://www.therainshed.com/module/search_content.htm?form_version=2&showSearchResults=1&search_keyword=foam&image=Search

Les

I have used this company in the past. Happy with their service.

https://www.foambymail.com/