A container including a first side wall and a second side wall that are permanently joined by at least one seam such that a chamber is formed between the side walls. A peelable seal separates the chamber into a first sub-chamber and a second sub-chamber that are capable of receiving liquid contents, which may be mixed if the peelable seal is opened. The seam includes a protrusion that extends into the chamber, and the peelable seal extends over the protrusion.
