I'm re-writing some R scripts that process and analyze spatial data into a package so that it will be easier to share. Initially I had just saved all the raster data/etc as TIFFs onto my working directory, and loaded it from there into the script each time I wanted to do an analysis using "stack" or "raster". What's the equivalent for a R package? I have a lot of rasters/shapefiles, some of which are quite large.