EPS Foam vs Soft Insulation

While there's definitely a winner and loser here when it comes to comparing temperatures for shipping perishables, hard foam has a few other variables.  Here's our 47 hour test (I got impatient and opened 'em up an hour early.)

These are 10x10x5 boxes packed with a 24 oz gel pack and 8 Treats each, plus the datalogger and a small amount (say, ¼ lb) of dry ice.

PT 1 (black line) is 1" thick Plymouth Foam SilverLiner.

PT 2 (blue line) is 1.5" thick ThermalShipping Renewliner. 

Yep, that's a 10 degree difference at the end of the test, and that's especially impressive because the SilverLiner is only 1" thick compared to 1.5" for the RenewLiner.  So why the heck would anyone use the Renewliner?  

SilverLiner vs Renew LIner


One word:  Space.  We can only fit 8, maybe 9 Treats into the SilverLiner.  We can fit 12 Treats plus one or two other items with the RenewLiner.

We think the SilverLiner looks way cleaner than the Renew, but at the end of the day we're a shipping company, not a looking company.  If we can only fit 8 Treats into a SilverLiner box, that limits our profit per order. 

That wraps it.  What works for us may not work for you, but now you've got one more datapoint to make a good decision on what the best way to ship for your business is.

Listen, it may sound too good to be true, but we are PSYCHED to help you learn how to ship your perishable product across the country.  If you have any questions about this article or anything surrounding perishable shipping, please comment below so we can share the knowledge.

If you're in San Diego and want to test your product packout, reach out via our Contact page below and we'll fit you into our testing schedule.  Yes, for free.  

If you have questions but can't get a package to us for testing, use the Contact page and I'll help as much as I can.  

Here's to your small food biz success!


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Nik Hawks


Nik Hawks helps run the show at Paleo Treats. Fascinated by humans in all their strange glory, Nik is harnessed in and pulling hard in pursuit of excellence with the rest of the PT Crew. Enjoy!

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