Sleeve art is not a specification. A tomato or high-wire crop wants more chip so the slab does not sit wet. Strawberry and blueberry gutters want more pith so the ends do not dry. Cucumber is closer to tomato. “70/30” means nothing without the chip band and the dust.
The growbag page names three programmes — tomato, strawberry/blueberry, cucumber — and two formats, growbag or open-top. Mix ratio, EC method, bag size, and drain layout stay per lot. Husk chips are the fraction that changes the water curve. Pith blocks are the other half of the same mix.
If the sample is a show unit punched for a photo, it is not the bag that will sit in the greenhouse. Send the crop and the irrigation. The floor is on growing media.