To hide a number or a mark until a container is unsealed and prevent foreign materials from entering therein on reading the sign, by printing information like lottery number S on the rear face of the inside paper of the container and laminating a polyolefin resin layer thereon.

Roofs 2G, 3G forming a gable roof at the upper part of the body of a liquid paper container are connected to the upper folding side panels 1G, 4G through a folding line 11 and further folding top panels 1T, 4T and flaps 2T, 3T wrapping these panels and sealing them face to face are provided through folding line 14. Information like lottery number P is printed on the rear face of the flaps 2T, 3T and further, a polyolefin resin layer like polyethylene resin is laminated thereon. And moreover, a heat-seal resistant agent is partly applied on the polyolefin resin layer. Mutual polyolefin resin layers on the rear face of top panels are separated from each other on unsealing the container owing to the heat-seal resistant agent, and hence, the information like the lottery numbers printed on the paper under the resin can be clearly read.