A bundle comprising a plurality of paper sheets lying upon another and defining a stack and a tie having a first end and a second end opposite to the first end is provided, wherein a first portion of the tie at the first end overlaps a second portion of the tie at the second end and is connected to the second portion to tie the stack, the first portion being positioned on an end face of the stack, wherein the first portion comprises at least one opening accessible by a user's finger to grip the tie and break the connection between the first and second end portions.