Following a new invention by a pair of yeshiva students, soft plastic milk bags can be cut by a knife built-in to a hard plastic container.
Because they clearly lack the ability to support themselves upright on a table, plastic containers specially designed to hold the one-liter bags are sold widely throughout the country.
Though the system works, as proven by its popularity over the course of decades and across the width and breadth of the land, it still has one small drawback - namely, the occasional absence of a handy knife or scissors with which to cut an opening in the bag. Teeth have been known to be used when people are thought not to be looking, usually leaving a jagged hole and inaccurate milk-dispensng.
This problem has now been solved. Two yeshiva student brothers, Shimon and Yitzchak Cohen of Tiberias, have invented Kankomat - an improved version of the milk container in that it comes complete with its own knife. The name stems from a combination of the words kankan (container) and automatic.
"Cry over hard-to-spill milk no more," recommend the Cohen brothers, who are selling the container for ten shekels. 
The knife is actually located at the top of the container, corresponding to the spot on the bag at which the milk is to be poured out. The bag is placed in the container, with the desired corner sliding into the sharp scissors-like aperture. Safely and cleanly, a snippet of the bag is removed, leaving a permanent opening via which the milk can be dispensed.
"Cry over hard-to-spill milk no more," recommend the Cohen brothers, who are selling the container for ten shekels.
They claim that families that have until now refrained from buying milk bags and choose the more expensive milk containers instead can save up to 900 shekels a year with the new invention.
A public relations campaign for the Kankomat is being run by Kobis PR KaHalakha Agency. To order, call 052-284-7551; from abroad, replace leading 0 with country code 972.