want to buy these to use in my pc to ship it. will the product stop expanding or pop if the space is smaller than the smallest option?

They will expand to their full limit. If you put them in a smaller case they can cause damage to parts. When i used it the foam bent the support bracket for the GPU. I bent it back so no worries but this is something you have to consider.

The image shows 2 packages. if i order 1, do i only get 1 or 2 in a package? instapack quick rt #10 (x1)

I ordered this a couple of years ago. As I recall there are 2 in the package, or at least there use to be. I would double check as everything is "shrinking" and doubling in price.

After you pop the bag, how long do you have to place the item before the foam hardens?

I've never used them, but I've watched the guys in the shop and they only use seconds to quickly put it in the shipping box and lay the item shipping on top, so the foam forms to the item.

ASIN	B01BU5W1IC
Batteries Included?	No
Batteries Required?	No
Best Sellers Rank	#278,617 in Office Products ( See Top 100 in Office Products ) #320 in Cushioning Foam
Brand	American Bubble Boy
Color	blue
Customer Reviews	4.3 4.3 out of 5 stars (46)
Date First Available	February 18, 2016
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	3.84 ounces
Manufacturer	Sealed Air
Material	Foam
Number of Items	1
Part Number	INSTA-20-1
Product Dimensions	18"L x 18"W
Size	#20 (18”x18”)
UPC	088234493133
Unit Count	1 Count

Instapak Quick RT Packing and Shipping Solution (#20 (18”x18”), Quantity 1) - American Bubble Boy

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