With what types of provisions(supplies) do Buck and his team leave Skagway?

When the sled finally moves,it falls on it's side. Raging at the unfair treatment, Buck leads the team in a run, scattering the belongings even further and running the sled over Hal. Finally taking the advice of those around them, they remove many of the superfluous luxuries, though Mercedes cries over them, and more dogs are added to the team. The journey begins. The new dogs are relatively useless -- Buck can teach them "what not to do," but he can't teach them "what to do."

And so it went, the inexorable elimination of the superfluous. Mercedes cried when her clothes-bags were dumped on the ground and article after article was thrown out. She cried in general, and she cried in particular over each discarded thing.