Abstract: Buckling of metallic cylindrical shells stiffened with helical composite stripes was investigated in the current study. A mathematical relationship between area ratio and thickness ratio of composite layer for externally pressurized metallic cylinder stiffened with helical composite stripes was proposed. An analytical formula for collapse load of such hybrid structure was derived. Numerical analysis and experimental verification were conducted. Furthermore, depth chart for full-scale hybrid cylinder was designed using analytical formulae. The results indicate that the maximum and minimum difference between numerical and theoretical results obtained using interpolation method are 5.2% and 0.9%, respectively. The theoretical, numerical and experimental data for samples agree favorably. The difference between theoretical and numerical results is 3.20%. The difference between theoretical and experimental results is 3.46%. Metallic cylindrical shells stiffened with multiple helical composite stripes is satisfy for a wide range of depths. Composite stripe stiffeners have vast potential for application in installed and reusable tubes.