Make sure you use the encumbrance rules from page 162 of the PHB. Many people tend to ignore those rules but that leads to situations like this.
The half-orc is carrying the gnome (and all of his gear) and all of the half-orc's gear. Don't forget to count all treasure being carried too.
The half-orc is carrying the gnome (and all of his gear) and all of the half-orc's gear. Don't forget to count all treasure being carried too.