The new product design has made possible the availability of all flask sizes from 25 to 175 cm². Maximum control when replacing nutrient depleted media is provided by the improved anti-drip edge and the modified canted neck. Easy access to the monolayer/suspension culture is provided by the the specially shaped pouring channel. It also facilitates the dosage of tissue culture media and cell suspensions. The stacking stability is improved by the anti-tip skirt under the canted neck and it also prevents media from running into the neck of the flask, thus minimising potential contamination.