Packing stability for symplectic $4$-manifolds
  We show that all closed symplectic 4-manifolds have the packing stability property: there are no obstructions beyond volume to embedding a collection of sufficiently small balls. This generalizes a theorem of Biran which gives the same result under the assumption that the symplectic form lies in a rational cohomology class. 
Olguta Buse and Richard Hind and Emmanuel Opshtein
math.SG