A lifting sling system for connecting various loads to a lifting hook, comprising a set of lifting sling units (10, 20) each consisting of a number of pre-assembled parts including a coupling member (11, 21), one or more sling leg portions (12, 22) and a connector (13, 23) at the end of each sling leg portion, said lifting sling system permitting selective coupling of at least one of said lifting sling units, at a lifting site, to said lifting hook, whereinsaid set of lifting sling units comprises only a small number of combinable lifting sling units, namely at least two and no more than totally five combinable lifting sling units, including - no heavy lifting sling units, - at least one and no more than three dual lifting sling units each consisting of five pre-assembled members being permanently connected to each other, namely: - a dual coupling member which is quick-connectable to said lifting hook at said lifting site, - a pair of sling leg portions connected to said dual coupling member, and - two connectors, one at the end of each sling leg portion for connection to said load at said lifting site, and - possibly no more than two single lifting sling units consisting of three pre-assembled members being permanently connected to each other, namely: - a single coupling member which is quick-connectable to said lifting hook at said lifting site, - a single sling leg portion connected to said single coupling member, and - a connector at the end of said single sling leg portion for connection to said load at said lifting site, there being no lifting sling unit in the system having more than two sling leg portions, the lifting sling system also comprising - a head link assembly having a closed head link dimensioned to be hung onto said lifting hook and adapted for quick-coupling to at least one and no more than two of said lifting sling units, characterised in that the lifting sling system comprises - an information carrier being permanently attached to the head link and having clear markings showing the various possible combinations of the lifting sling units, and the associated working load limits to be observed for each such combination, there being at least one permissible combination of lifting sling units having a total,of two sling leg portions but no permissible combination of lifting sling units having more than a total of four sling leg portions, said combinable lifting sling units being adapted for selective coupling of a particular load to said lifting hook in accordance with the information provided on the information carrier. - no heavy lifting sling units, - at least one and no more than three dual lifting sling units each consisting of five pre-assembled members being permanently connected to each other, namely: - a dual coupling member which is quick-connectable to said lifting hook at said lifting site, - a pair of sling leg portions connected to said dual coupling member, and - two connectors, one at the end of each sling leg portion for connection to said load at said lifting site, and - a dual coupling member which is quick-connectable to said lifting hook at said lifting site, - a pair of sling leg portions connected to said dual coupling member, and - two connectors, one at the end of each sling leg portion for connection to said load at said lifting site, and - possibly no more than two single lifting sling units consisting of three pre-assembled members being permanently connected to each other, namely: - a single coupling member which is quick-connectable to said lifting hook at said lifting site, - a single sling leg portion connected to said single coupling member, and - a connector at the end of said single sling leg portion for connection to said load at said lifting site, there being no lifting sling unit in the system having more than two sling leg portions, the lifting sling system also comprising - a single coupling member which is quick-connectable to said lifting hook at said lifting site, - a single sling leg portion connected to said single coupling member, and - a connector at the end of said single sling leg portion for connection to said load at said lifting site, there being no lifting sling unit in the system having more than two sling leg portions, the lifting sling system also comprising - a head link assembly having a closed head link dimensioned to be hung onto said lifting hook and adapted for quick-coupling to at least one and no more than two of said lifting sling units, - an information carrier being permanently attached to the head link and having clear markings showing the various possible combinations of the lifting sling units, and the associated working load limits to be observed for each such combination,