This is the current sack recipe, it'd be cool if, if you have farmer's delight installed, there was an alternate recipe for sacks where the flax was replaced with Farmer's Delight Canvas. You could also make a recipe so that you can make FD canvas from flax.

the texture looks really similar as well so it'd make a lot of sense intuitively.

also, it'd be nice to have a recipe to make Presents from create cardboard, if it doesn't exist already (id is create:cardboard, there might be a tag for it as well)

the sack recipe is there already. just appears when flax is disabled