In summary, the reaction of Co(OAc)2•4H2O and Hsal affords the aesthetically pleasing [Co16(µsal)16(µ3-OAc)16] (1) wheel, which displays weak ferromagnetic nearest neighbour exchange interactions, in agreement with DFT calculations. Ab initio NEVPT2 studies suggest the presence of large single ion easy-plane anisotropy. In the extended structure the wheels form dimeric capsules via inter-digitation of the sal/acetate ions and this extends to form infinite tubular stacks of capsules upon symmetry expansion. Attempts to make analogues of 1 with different M II ions, different carboxylates and derivatised salicylaldehyde ligands are in progress, with a view to also examining guest transport to the interior of the cages.