Startup Idea : Parcel Carrying between Cities/Countries

This will come with it's fair share of legalities. But very often on Facebook (and other outlets), people post whether 'so and so is traveling from one place to another', since a family member is sending a small package and would appreciate it if the traveler could help carry it. I've also seen urgent requests of vaccines requested from the US to places like Pakistan that someone urgently needs for their child. I believe there's a real need to connect parcel-senders to travelers to help solve this problem. PLEASE hit me up if you're interested or can poke any holes in this idea. Email: sarahiismail@gmail.com