Am i missing something or is this way more expensive than concrete? I know concrete can be a pain, but this stuff looks to be 4 or 5 times the price.

Yes, this is way to expensive. Home Depot and Lowes in Texas sells it for 9.88 a bag

Can I mix in a container other than the bag to use smaller amounts at a time?

This product appears to be a typical two-part expanding polyurethane foam. These are not particularly unusual products. They are usually not air-activated. You mix the two chemicals together in equal parts and then fairly quickly the reaction takes place and the liquid expands into a rigid foam. You could probably extract equal portions of the two chemicals from the two pouches, but really since you're here on Amazon just search for expanding polyurethane foam and you'll find the chemicals in various quantities where you won't have to deal breaking into the bag and then storing the ruptured bag(s).

Material	Polyurethane
Color	Green
Brand	SIKA
Product Dimensions	8.5"L x 9.8"W
Assembly Required	No
Number of Pieces	1
Unit Count	1.0 Count
UPC	815202002611
Global Trade Identification Number	00815202002611
Manufacturer	Sika Corporation
Part Number	Sika - 483503
Item Weight	1 pounds
Item model number	Sika - 483503
Is Discontinued By Manufacturer	No
Size	33 oz
Item Package Quantity	1
Included Components	Sika - 483503
Batteries Included?	No
Batteries Required?	No
Warranty Description	Warranty

Sika Postfix - Fence Post Mix - Light Green - Mix-in-The-Bag Expanding Foam for Supporting Non-Structural Posts - 978 ml

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