I was looking for my bags "old" Bosch bsg71842 which is still in perfect working order. At the time of purchase bags, amazon proposes in this case to just under 24 euros is 2euros the bag. This is clearly an excellent choice for 12 euros, you get that 4. Do the math, the four free is not a business fallacious argument. However, I did not understand the type of bags between G and types GXXL / GXL. This is indicated on the box that it lasts longer. Why, how, mystery! Finally, whatever, for bags "Made in Germany" from the brand of the vacuum cleaner, I put five stars because I am fully satisfied.