EXHIBIT 21

SONOCO PRODUCTS COMPANY AND CONSOLIDATED SUBSIDIARIES

SUBSIDIARIES OF THE REGISTRANT

1. Sonoco-Engraph Puerto Rico, Inc., a 100%-owned domestic subsidiary, incorporated in Delaware

2. Engraph Puerto Rico, Inc., a 100%-owned domestic subsidiary, incorporated in Delaware

3. Sonoco Flexible Packaging Co., Inc., a 100%-owned domestic subsidiary, incorporated in South Carolina

4. Gunther of America, Inc., a 100%-owned domestic subsidiary, incorporated in Delaware

5. Sonoco Development, Inc., a 100%-owned domestic subsidiary, incorporated in South Carolina

6. Sonoco Recycling, Inc., a 100%-owned domestic subsidiary, incorporated in North Carolina

7. Inspiral, LLC, a 100%-owned domestic subsidiary, incorporated in Delaware

8. Sonoco (SPG), Inc., a 100%-owned domestic subsidiary, incorporated in Wisconsin

9. Trident Graphics NA LLC, a 100%-owned domestic subsidiary, incorporated in North Carolina

10. Gunther U.S.A., Inc., a 100%-owned domestic subsidiary, incorporated in Tennessee

11. Sonoco Paperboard Group LLC, a 100%-owned domestic subsidiary, incorporated in South Carolina

12. Sebro Plastics, Inc., a 100%-owned domestic subsidiary, incorporated in Michigan

13. Convex Mold, Inc., a 100%-owned domestic subsidiary, incorporated in Michigan

14. Sonoco Crellin B.V., a 100%-owned foreign subsidiary, incorporated in the Netherlands

15. Southern Plug & Manufacturing, Inc., a 100%-owned domestic subsidiary, incorporated in Louisiana

16. Sonoco Partitions, Inc., a 100%-owned domestic subsidiary, incorporated in South Carolina

17. Industrial Machine Co., Inc., a 100%-owned domestic subsidiary, incorporated in Missouri

18. Sonoco Structural Fiber, LLC, a 95%-owned domestic subsidiary, incorporated in South Carolina

19. Polysack AS, Inc., a 100%-owned domestic subsidiary, incorporated in South Carolina

20. Georgia Paper Tube, Inc., a 100%-owned domestic subsidiary, incorporated in Georgia

21. Sonoco CorrFlex, LLC, a 100%-owned domestic subsidiary, incorporated in North Carolina

22. Sonoco CorrFlex D & P, LLC, a 100%-owned domestic subsidiary, incorporated in North Carolina

23. Sonoco CorrFlex Display and Packaging, LLC, a 100%-owned domestic subsidiary, incorporated in North Carolina

24. Sonoco Hutchinson, LLC, a 100%-owned domestic subsidiary, incorporated in Kansas

25. U.S. Paper Mills Corp., a 100%-owned domestic subsidiary, incorporated in Wisconsin

26. Hayes Manufacturing Group, Inc., a 100%-owned domestic subsidiary, incorporated in Wisconsin

27. Sonoco Phoenix, Inc., a 100%-owned domestic subsidiary, incorporated in Ohio

28. SPC Management, Inc., a 100%-owned domestic subsidiary, incorporated in Delaware

29. SPC Capital Management, Inc., a 100%-owned domestic subsidiary, incorporated in Delaware

30. SPC Resources, Inc., a 100%-owned domestic subsidiary, incorporated in Delaware

31. Sonoco International, LLC, a 100%-owned domestic subsidiary, incorporated in Delaware

32. Sonoco of Puerto Rico, a 100%-owned domestic subsidiary, incorporated in South Carolina

33. Sonoco Luxembourg S.a.r.l., a 100%-owned foreign subsidiary, incorporated in Luxembourg

34. Sonoco Netherlands Holding II BV, a 100%-owned foreign subsidiary, incorporated in the Netherlands

35. Sonoco Canada Corporation, a 100%-owned foreign subsidiary, incorporated in Canada

36. Wisenberg U.S., Inc., a 100%-owned domestic subsidiary, incorporated in South Carolina

37. Sonoco Flexible Packaging Canada Corporation, a 100%-owned foreign subsidiary, incorporated in Canada

38. 1190138 Ontario Inc, a 100%-owned foreign subsidiary, incorporated in Canada

39. S W Inc., a 100%-owned foreign subsidiary, incorporated in Canada

40. Sonoco Ventures UK Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

41. Sonoco Absorbent Technologies Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

42. Sonoco Holdings UK Limited, a 100%-owned domestic subsidiary, dually incorporated in Delaware and in the United Kingdom

43. Sonoco Milnrow, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

44. Sonoco Products Company UK, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

45. Sonoco Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

46. Sonoco Capseals Liners Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

47. TPT Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

48. Sonoco Polysack Limited, a 100%-owned domestic subsidiary, dually incorporated in South Carolina and in the United Kingdom

49. Sonoco Packaging Tapes Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

50. Sonoco Board Mills Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

51. Sonoco UK Leasing Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

52. Sonoco Reels Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

53. Capseals Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

54. Sonoco Europe Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

EXHIBIT 21

SONOCO PRODUCTS COMPANY AND CONSOLIDATED SUBSIDIARIES

SUBSIDIARIES OF THE REGISTRANT

55. Unit Reels & Drums Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

56. Grove Mill Paper Company Limited, a 99.9%-owned foreign subsidiary, incorporated in the United Kingdom

57. TPT Board Mills Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

58. Heathfield Reels Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

59. Capseals Liners Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

60. Cap Liners Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

61. Sonoco Packaging Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

62. Nathaniel Lloyd & Company Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

63. Corepak Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

64. Friarsgate Studio Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

65. Sonoco Consumer Products Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

66. Sonoco Iberia, S.L., a 100%-owned foreign subsidiary, incorporated in Spain

67. Sonoco Bonmati, S.A., a 100%-owned foreign subsidiary, incorporated in Spain

68. Sonoco Pina, S.A., a 100%-owned foreign subsidiary, incorporated in Spain

69. Sonoco Alcore Nederland B.V., a 100%-owned foreign subsidiary, incorporated in the Netherlands

70. Sonoco Alcore—Demolli S.r.l., a 100%-owned foreign subsidiary, incorporated in Italy

71. Sonoco Netherlands Holding I B.V., a 100%-owned foreign subsidiary, incorporated in the Netherlands

72. Sonoco-Alcore AS, a 100%-owned foreign subsidiary, incorporated in Norway

73. Sonoco Ambalaj Sanayi Ve Ticaret Anonim Sirketi, a 100%-owned foreign subsidiary, incorporated in Turkey

74. Sonoco-Alcore Spolka Z Ograniczona Odpowiedzialnoscia, a 100%-owned foreign subsidiary, incorporated in Poland

75. Sonoco International Holdings GmbH, a 100%-owned foreign subsidiary, incorporated in Switzerland

76. Sonoco Alcore NV, a 100%-owned foreign subsidiary, incorporated in Belgium

77. Sonoco International BVI, a 100%-owned foreign subsidiary, incorporated in the British Virgin Islands

78. Sonoco Paper Mill & IPD Hellas Sa, a 100%-owned foreign subsidiary, incorporated in Greece

79. Sonoco CPD Greece SA, a 100%-owned foreign subsidiary, incorporated in Greece

80. Sonoco SAS, a 100%-owned foreign subsidiary, incorporated in France

81. Tubetex NV, a 100%-owned foreign subsidiary, incorporated in Belgium

82. Sonoco Paper France S.A.S, a 100%-owned foreign subsidiary, incorporated in France

83. Sonoco Consumer Products SAS, a 100%-owned foreign subsidiary, incorporated in France

84. Sonoco Plastics Germany GmbH, a 100%-owned foreign subsidiary, incorporated in Germany

85. Sonoco Deutschland Holdings GmbH, a 100%-owned foreign subsidiary, incorporated in Germany

86. Sonoco Caprex Karton- und Papierverarbeitungs AG, a 100%-owned foreign subsidiary, incorporated in Switzerland

87. Sonoco Deutschland GmbH, a 100%-owned foreign subsidiary, incorporated in Germany

88. Sonoco Alcore GmbH, a 100%-owned foreign subsidiary, incorporated in Germany

89. Beteiligungen Sonoco Deutschland Vermogensverwaltungsgesellschaft mbh, a 100%-owned foreign subsidiary, incorporated in Germany

90. Sonoco Australia Pty Ltd, a 100%-owned foreign subsidiary, incorporated in Australia

91. Sonoco New Zealand Limited, a 100%-owned foreign subsidiary, incorporated in New Zealand

92. Sonoco Asia, L.L.C., a 79.2%-owned domestic subsidiary, incorporated in Delaware

93. Sonoco Asia Management Company, L.L.C., a 70%-owned domestic subsidiary, incorporated in Delaware

94. Sonoco Thailand Ltd, a 79.2%-owned foreign subsidiary, incorporated in Thailand

95. AGD (Thailand) Limited, a 79.2%-owned foreign subsidiary, incorporated in Thailand

96. Sonoco Taiwan Ltd, a 79.2%-owned foreign subsidiary, incorporated in Taiwan

97. Sonoco Singapore Pte. Ltd., a 79.2%-owned foreign subsidiary, incorporated in Singapore

98. Sonoco Holdings Sdn Bhd, a 79.2%-owned foreign subsidiary, incorporated in Malaysia

99. Sonoco Malaysia Sdn Bhd, a 79.2%-owned foreign subsidiary, incorporated in Malaysia

100. Sonoco Products Malaysia Sdn Bhd, a 79.2%-owned foreign subsidiary, incorporated in Malaysia

101. Sonoco Hongwen Paper Co Ltd, a 63.6%-owned foreign subsidiary, incorporated in China

102. PT Sonoco Indonesia, a 79.2%-owned foreign subsidiary, incorporated in Indonesia

103. Sonoco Kaiping Packaging Company Ltd, a 79.2%-owned foreign subsidiary, incorporated in China

104. Sonoco do Brazil Ltda, a 100%-owned foreign subsidiary, incorporated in Brazil

105. Sonoco Participacoes Ltda., a 100%-owned foreign subsidiary, incorporated in Brazil

106. Sonoco For Plas do Brazil Ltda, a 51%-owned foreign subsidiary, incorporated in Brazil

107. Sonoco de Colombia Ltda, a 100%-owned foreign subsidiary, incorporated in Colombia

108. Colombiana P.M., LLC, a 100%-owned domestic subsidiary, incorporated in Delaware

EXHIBIT 21

SONOCO PRODUCTS COMPANY AND CONSOLIDATED SUBSIDIARIES

SUBSIDIARIES OF THE REGISTRANT

109. Inversiones Sonoco Limitada, a 100%-owned foreign subsidiary, incorporated in Chile

110. Sonoco Venezolana, a 90%-owned foreign subsidiary, incorporated in Venezuela

111. Sonoco Netherlands Holding III BV, a 100%-owned foreign subsidiary, incorporated in the Netherlands

112. Sonoco de Mexico SA de CV, a 100%-owned foreign subsidiary, incorporated in Mexico

113. Manufacturas Sonoco SA de CV, a 100%-owned foreign subsidiary, incorporated in Mexico

114. Servicios Mexicanos Ejecutivos Sa de CV, a 100%-owned foreign subsidiary, incorporated in Mexico

115. Sonoco SA de CV, a 100%-owned foreign subsidiary, incorporated in Mexico

116. Sonoco (Weifang) Packaging Company, Ltd., a 79.2%-owned foreign subsidiary, incorporated in China

117. Sonoco Yatai Pinghu Packaging Co Ltd, a 79.2%-owned foreign subsidiary, incorporated in China

118. Sonoco-Alcore Oy, a 100%-owned foreign subsidiary, incorporated in Finland

119. Sonoco Alcore AB, a 100%-owned foreign subsidiary, incorporated in Sweden

120. Sonoco IPD France SAS (fka Sonoco Alcore SAS), a 100%-owned foreign subsidiary, incorporated in France

121. ZAO Sonoco Alcore, a 100%-owned foreign subsidiary, incorporated in Russia

122. Sonoco-Alcore Ou, a 100%-owned foreign subsidiary, incorporated in Estonia

123. Sonoco Operadora S de R L de C V, a 100%-owned foreign subsidiary, incorporated in Mexico

124. Sonoco Venture International Holdings GmbH, a 100%-owned foreign subsidiary, incorporated in Switzerland

125. Sonoco-Alcore S.a.r.l., a 100%-owned foreign subsidiary, incorporated in Luxembourg

126. Sonoco Cores and Paper Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom

127. Sonoco Poland Holdings BV, a 100%-owned foreign subsidiary, incorporated in the Netherlands

128. Sonoco JV GmbH & Co. KG, a 100%-owned foreign subsidiary, incorporated in Germany

129. Sonoco Poland—Packaging Services Spolka Z Ograniczona Odpowiedzialnoscia, a 100%-owned foreign subsidiary, incorporated in Poland

130. Trident Graphics Canada Corporation, a 100%-owned foreign subsidiary, incorporated in Canada

131. Sonoco (Xiamen) Packaging Company Ltd, a 79.2%-owned foreign subsidiary, incorporated in China

132. Sonoco Services, LLC, a 100%-owned domestic subsidiary, incorporated in Delaware

133. Sonoco India Private Limited, a 79.2%-owned foreign subsidiary, incorporated in India

134. Sonoco (Shanghai) Co., Ltd, a 79.2%-owned foreign subsidiary, incorporated in China

135. CP Acquisition, LLC, a 100%-owned domestic subsidiary, incorporated in South Carolina

136. Clear Pack Company, a 100%-owned domestic subsidiary, incorporated in Illinois

137. Matrix Packaging Canada ULC, a 100%-owned foreign subsidiary, incorporated in Canada

138. Sonoco Plastics, Inc., a 100%-owned domestic subsidiary, incorporated in Delaware

139. Sonoco (Taicang) Packaging Co., Ltd, a 79.2%-owned foreign subsidiary, incorporated in China

140. Fair Lawn Packaging Services, LLC, a 100%-owned domestic subsidiary, incorporated in South Carolina

141. Sonoco Liquidation, LLC, a 100%-owned domestic subsidiary, incorporated in South Carolina

142. Sonoco Contract Services S. de R.L. de C.V., a 100%-owned foreign subsidiary, incorporated in Mexico.

143. Sonoco Asia Holding S.a.r.l., a 100%-owned foreign subsidiary, incorporated in Luxembourg

144. Sonoco Sustainability Solutions, LLC, a 100%-owned domestic subsidiary, incorporated in South Carolina

145. APEI IOM Holdings Corporation, a 100%-owned domestic subsidiary, incorporated in Delaware

146. APEI (IOM), a 100%-owned foreign subsidiary, incorporated in Isle of Man

147. APEI Ireland, a 100%-owned foreign subsidiary, incorporated in Ireland

148. Sonoco Holdings, Inc., a 100%-owned domestic subsidiary, incorporated in Delaware

149. Sonoco Luxembourg Holding S.a.r.l., a 100%-owned foreign subsidiary, incorporated in Luxembourg

150. APEI UK Limited, a 100%-owned foreign subsidiary, incorporated in the United Kingdom