80lb Heavyweight Cardstock is the standard for "solid" structural integrity.
Usually black or neutral colors like kraft or cream to act as a "foundation". IMG_0622.MOV
The term "solid paper" in this context typically refers to the used as the structural base for the project shown in the video. Key Paper Specifications 80lb Heavyweight Cardstock is the standard for "solid"
Creating "Moving Parts" like flaps, pockets, and hinges that need to be durable. IMG_0622.MOV
If you are trying to replicate the "solid paper" look or structure from a tutorial with this file name, these are the standard materials used:
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