Remmy’s Open-Top and Closed -Top Growbags are the finest growing medium for crop cultivation as they are produced with our special, multilayer co-extrusion strategy from the highest quality materials. This method allows growers to save time, effort and space as they are compact and ready to use. Simply plant the seeds, add water and watch your crops thrive.bs offer flexibility in growing as they can be set in troughs, gutters and trays.