Bush planes are not known for their extravagant load capacity, however, it is possible for them to carry a certain amount of weight. The actual capacity itself is determined by a variety of factors, similar to the range of the plane. A bush plane at the maximum load will also likely have a shorter range due to the added weight and fuel consumption ferrying cargo requires. Similar to the flight range, carrying capacity can be affected by the smallest variations in the configuration of the plane.
Some bush planes have fairly generous cargo capacities of around 300kg or more, whereas some have far less capacity. For example, the Aeropro Eurofox has a passenger weight limit of 100kg, which is quite strict even for a two-seater single-engine aircraft.
Other aircraft, such as the Cessna 206 are far more capable workhorses and can carry up to five passengers and one pilot, which may be why this plane is one of the most popular and relied upon in areas like Alaska. Something like the Quest Kodiak has even more capacity and can manage nine passengers and a pilot.
Due to the different ratings of these aircraft and how they might be configured, we always recommend that you check with the pilot or manufacturer to verify how much weight an aircraft can safely carry.