2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/63670We describe some problems, observations, and conjectures concerning thickness and packing density of knots and links in $\sp^3$ and $\R^3$. We prove the thickness of a nontrivial knot or link in $\sp^3$ is no more than $\fracπ{4}$, the thickness of a Hopf link. We also give arguments and evidence supporting the conjecture that the packing density of thick links in $\R^3$ or $\sp^3$ is generally less than $\fracπ{\sqrt{12}}$, the density of the hexagonal packing of unit disks in $\R^2$.6 pages; to appear in Contemporary Mathematics volume edited by Calvo, Millett & RawdonDifferential GeometryGeometric Topology57M25, 53A04, 49Q10, 52C15, 52C17text