Library collection development is directly related to the issues of placement, storage and delivery of documents. The eternal storage of the totality of documents that make up the national heritage is one of the functions of national libraries (NL), which solve the problem of placing materials with consideration to their financial and other capabilities.An overview of the successful national libraries’ practice in solving the lack of storage space problem is presented (Library of Congress, British Library, German National Library, National Diet Library of Japan, National Library of France, Royal Library of Sweden, Austrian National Library, National Library of the Czech Republic, Royal Library of the Netherlands). The experience of the Russian State Library in solving this problem is also analyzed.Finding place for growing collections with a tight of storing conditions is a challenge that requires not only constant attention, but also a flexible approach. Various options for solving this problem are being considered: construction of new (including remote) storage facilities; efficient use of existing premises (for example, an implementation of high density storage systems or co-opting of premises built for other purposes — idle exhibition centers functional conversion, etc.); lease of rentable areas.The research is based on the analysis of information from official websites of the national libraries.The appendix presents the results of the NL survey on the following issues: withdrawing of certain categories of materials, dispatching them to depositories; construction of new storage buildings; statistics concerning active use and actual availability of collections.