These particular ones, I'm not sure what Food Grade means, but these are a stiff plastic once they are heated. Hard edges on the heated/treated side. Probably keep something very water proof.... I use these for containing small decals I print to prevent stuff happening in shipping. Better than rubber bands if a box opens up en route. Hope this helps.

Manufacturer	Morepack
Part number	YUS-5x5-200
Item Weight	231 g
Package Dimensions	20.09 x 13.89 x 2.31 cm; 231 g
Item model number	YUS-5x5-200
Size	5x5 Inch
Colour	Clear
Material	Polyvinyl Chloride (PVC)
Special Features	Tearproof
Batteries included?	No
Batteries Required?	No

Shrink Wrap Bags,200 Pcs 5x5 Inches Clear PVC Heat Shrink Wrap for Packagaing Soap,Bath Bombs,Candles,Small Gifts, Jars and Homemade DIY Projects

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