System for dispensing individual portions of beverages precursor

System of a beverage portion dispenser arranged for dispensing beverage precursor portions, said portions being individually contained in a flexible portioning band, said band being held in a casing, said dispenser comprising:

• a receiving area for receiving and holding the casing,
• a band drive assembly arranged for taking the band out of the casing and for moving successively each sealed beverage precursor portion to a separating assembly,
• a separating assembly configured to individually separate each portion from the band,
• a collecting chamber configured to store the band separated from the portion, and
• a pushing member configured to push the whole band out of the collecting chamber to the receiving area and a casing holding a flexible portioning band, said band containing a plurality of individually sealed beverage precursor portions and said casing comprising a top wall, said top wall comprising a front part and a rear part, wherein:
• said top wall comprises an aperture, said aperture being positioned in the front part of the top wall, and
• the rear part of the top wall is configured to be openable under the application of an inwardly oriented force, wherein when the casing is held inside the receiving area, the rear part of the top wall is positioned below the collecting chamber.