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Cargo spacecraft deliver two broad kinds of material to the International Space Station (ISS): routine provisions and station hardware, plus mission-specific scientific investigations. A single flight may carry food, clothing and spare parts alongside freezers, incubators, biological samples, experiment instruments, exercise equipment, gases for spacesuits and research hardware. The exact mix changes with each mission, so no one flight’s manifest should be treated as a universal ISS cargo list.
Recent NASA missions show the range clearly. SpaceX’s Dragon CRS-34 carried about 6,500 pounds of science investigations, supplies and equipment in May 2026. Northrop Grumman’s Cygnus CRS-24 carried approximately 11,000 pounds in April 2026, including quantum-science hardware, stem-cell production equipment and space-weather instruments.
What an ISS cargo spacecraft carries
ISS cargo is planned around the station’s immediate operating needs and the investigations approved for that flight. The payload can be grouped into four practical categories.
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Crews need regular resupply for eating, drinking, hygiene and daily work. NASA mission descriptions commonly identify food, crew supplies and general equipment. A JAXA description of the older HTV-2 mission gives a more detailed historical example: space food, potable-water containers, clothing, soap, shampoo and other crew commodities were packed in cargo-transfer bags. That list illustrates the types of items that can fly; it is not a current checklist for every cargo vehicle.
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Station logistics and maintenance equipment
Vehicles also bring hardware that keeps the orbital laboratory operating. Examples include spare parts, experiment samples, exercise equipment, eye-imaging hardware, portable freezers and the fittings or tanks needed to replenish station systems. Oxygen and nitrogen tanks on Cygnus CRS-24, for example, supported spacesuit-recharge operations rather than serving as a science experiment.
Scientific investigations
Research payloads range from small biological samples to complete instruments. They can investigate human health, materials, Earth observation, physics, astronomy or planetary science. Some experiments are designed to run automatically; others require crew members to install hardware, collect samples, change fluids or move specimens between temperature-controlled locations.
Support hardware for experiments
An investigation often needs more than its headline instrument. Freezers, incubators, sample containers, computers, power adapters and experiment-specific tools travel with it. This support equipment can occupy substantial cargo volume and may be essential to preserving a sample or operating the investigation safely.
| Cargo category | Examples reported for ISS missions | Why it is needed |
|---|---|---|
| Crew provisions | Food, drinking-water containers, clothing, soap and shampoo | Daily living and personal hygiene |
| Station logistics | Spare parts, exercise equipment, eye-imaging hardware, oxygen and nitrogen tanks | Maintenance, crew health and spacesuit support |
| Research payloads | Bone scaffolds, blood and spleen studies, stem-cell hardware, quantum-science modules | Conducting investigations in microgravity |
| Research support | Portable freezers, incubators, sample containers and experiment equipment | Preserving samples and enabling experiment operations |
Examples from recent cargo flights
Dragon CRS-34: about 6,500 pounds in May 2026
NASA reported that Dragon CRS-34 launched on May 15, 2026, with about 6,500 pounds of science investigations, supplies and equipment. NASA’s station coverage said Dragon docked on May 17 carrying nearly 6,500 pounds of food, supplies and equipment. The two descriptions refer to the same mission total while emphasizing different parts of the manifest.
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The investigations named by NASA show how diverse one Dragon flight can be:
- A project evaluating how well Earth-based simulators reproduce conditions associated with microgravity.
- A wood-based bone-scaffold investigation. The scaffold is intended to support research relevant to fragile-bone conditions and how bone tissue develops or repairs itself.
- Equipment for studying changes in red blood cells and the spleen during spaceflight.
- An instrument that measures charged particles around Earth, contributing to knowledge of the space environment.
- An investigation related to planet formation.
- An instrument measuring sunlight reflected by Earth and the Moon, supporting observations of how these bodies reflect light.
These examples include both complete science instruments and hardware that enables biological or physical measurements. They also demonstrate why “science cargo” is not synonymous with a single type of experiment: the same vehicle can carry human-health research, space physics, planetary science and Earth-orbit observations.
Cygnus CRS-24: approximately 11,000 pounds in April 2026
Northrop Grumman’s Cygnus XL launched on April 11, 2026. NASA reported approximately 11,000 pounds of cargo, a larger mission total than the figure reported for Dragon CRS-34. The numbers are mission-reported cargo amounts, not standardized vehicle-capacity ratings and not a like-for-like comparison of what either spacecraft can always carry.
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- A quantum-science module for experiments that use quantum behavior under orbital conditions.
- Hardware intended to produce more therapeutic stem cells for research involving blood diseases and cancer.
- Model organisms for studying the gut microbiome and how spaceflight affects host–microbe relationships.
- A receiver designed to improve space-weather models by collecting measurements useful for understanding conditions around Earth.
After Cygnus arrived, NASA described more than 2,300 pounds of research hardware and science experiments being unloaded, along with portable science freezers, a new exercise system, eye-imaging hardware and oxygen and nitrogen tanks for spacesuit recharge. The unloading report illustrates that a cargo mission can combine research, crew health, exercise and station consumables in the same vehicle.
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Why some cargo needs special handling
Biological samples and other time-sensitive materials cannot simply remain in a spacecraft until the crew has time to process them. During the CRS-24 arrival, astronauts transferred research samples from portable freezers aboard Cygnus into the station’s Minus Eighty-Degree Laboratory Freezer for ISS (MELFI) and into MERLIN incubators. The transfer protected samples at their required temperatures and moved them into equipment designed for longer-term station operations.
This sequence explains why a manifest may list both an experiment and several pieces of support hardware. A sample-based investigation needs a controlled thermal environment during launch, docking, unloading and analysis. Crew procedures, transfer containers and station storage are part of the experiment’s logistics even though they may not appear in its short public description.
How NASA assigns cargo to a vehicle
The ISS program coordinates payload assignments. NASA’s researcher guide states that “Payload developers do not manifest directly with the launch provider for transport to ISS.” In practice, investigators work through the ISS program, which places an approved payload on a suitable visiting vehicle and integrates its safety, power, data, temperature and crew-operation requirements.
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Which spacecraft deliver cargo to the ISS?
NASA’s ISS facts material identifies four cargo spacecraft serving the station at a high level:
| Spacecraft family | Operator or agency identified by NASA | How to interpret its cargo |
|---|---|---|
| Dragon | SpaceX | Mission-specific combinations of food, supplies, equipment and investigations, such as CRS-34 |
| Cygnus | Northrop Grumman | Resupply and research missions, including the CRS-24 cargo described above |
| HTV | JAXA | Japanese cargo-transfer missions; HTV-2 provides an older example of crew commodities and experiment supplies |
| Progress | Russia | One of the cargo vehicles NASA lists in its ISS overview; a particular manifest must be checked for the mission in question |
NASA’s retrospective on 2025 also referred to HTV-X1 and Cygnus XL as vehicles visiting the station that year. Vehicle schedules and operational status can change, so a current mission release is the appropriate source for a specific launch or arrival date.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to read an ISS cargo manifest
When you encounter a manifest, separate the headline cargo total from the itemized contents. A useful reading method is:
- Identify the mission and date. Cargo totals belong to a named flight, such as Dragon CRS-34 on May 15, 2026, or Cygnus CRS-24 on April 11, 2026.
- Classify each item. Mark it as a crew provision, station-maintenance item, research payload or research-support component.
- Look for handling requirements. Words such as freezer, incubator, refrigerated, biological sample or time-sensitive indicate that temperature control and crew transfer procedures matter.
- Distinguish hardware from results. A payload may be an instrument that collects data, a biological specimen that is analyzed later, or equipment that enables another experiment.
- Check the qualification on every number. “About 6,500 pounds” and “approximately 11,000 pounds” are reported mission totals, not universal capacities for all flights of those spacecraft.
How much research is conducted on the station?
Cargo flights are individual deliveries within a much larger research program. NASA’s 2026 retrospective reported that more than 750 experiments supported exploration missions, improved life on Earth and opened commercial opportunities in low Earth orbit during 2025. That figure is station-wide for the year; it is not the number of experiments on one Dragon or Cygnus flight, nor does it mean every investigation arrived during 2025.
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Why the manifest changes from one flight to the next
ISS research is scheduled around crew time, station resources and the scientific question being studied. One flight may prioritize biological samples requiring a freezer and incubator, while another emphasizes a large instrument, replacement hardware or consumables. Cargo also reflects what must be returned, installed or replenished after earlier missions.
For that reason, a short manifest can understate the complexity of a delivery. “Food and supplies” may include many separate commodities; “a stem-cell investigation” may include production hardware, culture materials and temperature-controlled storage; and “a space-weather instrument” may require power, data and installation equipment. The mission-specific list is the reliable answer for what a particular spacecraft is carrying.
Bottom line
An ISS cargo spacecraft is a resupply vehicle and a mobile laboratory logistics system at the same time. It can carry meals and clothing, spare parts and gases, exercise and medical equipment, scientific instruments, biological samples, freezers and incubators. The Dragon CRS-34 and Cygnus CRS-24 missions in 2026 demonstrate the range—from bone scaffolds and blood-cell studies to quantum science, stem-cell production and space-weather measurements—while their different cargo totals show why every manifest must be read in its mission context.
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