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Analytical treatment of skyrmions given by rational map (RM) ansaetzeproposed recently for the Skyrme model is extended to the model including the6-th order term in chiral fields derivatives in the lagrangian (the SK6 variantof the model) and used for calculation of different properties ofmultiskyrmions. For special class of profile functions approximating the trueprofile and the domain wall behaviour at the same time, the masses and otherstatic properties of multiskyrmions are expressed in terms of the Euler-typeintegrals. An upper bound is obtained for the masses of RM multiskyrmions whichis close to the calculated masses, especially at large B. The gap betweenrigorous upper bound and lower bound, obtained for the SK6 model as well, forlarge B multiskyrmions is less than 9%, in comparison with about 4% for the SK4(Skyrme) variant. The basic properties of such bubbles of matter areinvestigated, some of them, e.g. the thickness of the bubbles envelope, beingof universal character, i.e. they do not depend on baryon number ofconfiguration, or reveal a simple and natural dependence. The dependence ofthese properties on the number of flavours is absent or very weak in bothmodels. Qualitatively, the properties of the baryonic bags are the same for theSK6 and SK4 variants of the model, although differ in some details.Comment: 16 pages, no figure

Multiskyrmions and baryonic bags