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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesCargo spacecraft deliver far more than meals to the International Space Station (ISS). A typical mission combines crew provisions, replacement parts, experiment samples, laboratory hardware, exercise and medical equipment, gases, and the packaging or freezers needed to keep research usable. The exact mix is mission-specific: NASA reported about 6,500 pounds on SpaceX’s Dragon CRS-34 and approximately 11,000 pounds on Northrop Grumman’s Cygnus CRS-24, but neither figure is a universal capacity for every flight.
What “cargo” means on an ISS resupply flight
An ISS cargo vehicle is a flying logistics system. Its manifest is assembled around the station’s current needs, the experiments ready for launch, the vehicle’s loading constraints, and the schedule of crew activities. That is why two consecutive resupply flights can have very different contents.
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NASA’s recent descriptions group the payload into four overlapping purposes:
- Crew logistics: food, clothing, hygiene items, potable water containers and other daily-use commodities.
- Station logistics: spare parts, tools, maintenance equipment, exercise hardware, gases and other items that keep the outpost operating.
- Science payloads: biological samples, model organisms, materials experiments, sensors and complete investigation packages.
- Research support: freezers, incubators, sample-transfer containers and other hardware that preserves or operates an investigation after arrival.
These categories are not a universal checklist. A particular flight may carry many food bags and little new hardware, or it may be dominated by research equipment and time-sensitive samples. Cargo planners also account for whether an item must be refrigerated, frozen, incubated, kept in a controlled atmosphere or installed in an external station facility.
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Examples of routine supplies and station equipment
Routine supplies make long-duration habitation possible. A JAXA description of the older HTV-2 mission lists examples packed in cargo-transfer bags: space food, potable-water containers, experiment samples, spare parts, clothing, soap, shampoo and other crew commodities. Those examples show the range of “ordinary” cargo, but they should not be read as a current packing list for every HTV, Dragon, Cygnus or Progress flight.
Food, water and personal-use items
Packaged meals and snacks are selected for shelf life, nutrition, mass and compatibility with the station’s galley and storage systems. Water containers supplement the station’s recycling systems and provide a practical reserve. Clothing and hygiene products replace consumables used by the crew over months in orbit; even small items matter because a resupply vehicle is one of the few opportunities to refresh them.
Maintenance and replacement hardware
Spare parts, tools and equipment are shipped because many repairs cannot wait for a future launch. Cargo can include hardware for life-support systems, experiment racks, electrical equipment or station structures. The manifest may also include packaging that lets the crew safely stage, move and dispose of items after unloading.
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Exercise, medical and environmental-support equipment
Exercise systems counter the loss of bone and muscle caused by microgravity. Medical and health-monitoring hardware supports crew care and research. NASA’s account of Cygnus CRS-24 specifically mentions a new exercise system, eye-imaging hardware, and oxygen and nitrogen tanks used to recharge spacesuits. Those tanks illustrate that resupply includes consumable gases, not just solid objects.
What recent Dragon and Cygnus missions carried
The clearest way to understand the variety is to compare recent NASA mission reports. The weights below are the totals NASA reported for those specific flights. They are not directly comparable vehicle-capacity ratings: each mission used its own manifest definition, launch date and cargo mix.
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| Mission | Reported cargo | Examples NASA highlighted | What the number means |
|---|---|---|---|
| SpaceX Dragon CRS-34 | About 6,500 pounds of science investigations, supplies and equipment; a docking report described nearly 6,500 pounds of food, supplies and equipment | Bone-scaffold research, blood and spleen studies, charged-particle measurements, planet-formation research, Earth-and-Moon reflected-light measurements, food and station supplies | A mission total reported by NASA for the May 15, 2026 launch and May 17, 2026 docking |
| Northrop Grumman Cygnus CRS-24 (Cygnus XL) | Approximately 11,000 pounds of cargo; later unloading coverage identified more than 2,300 pounds of research hardware and experiments | Quantum-science module, therapeutic stem-cell production hardware, gut-microbiome model organisms, space-weather receiver, portable freezers, exercise system, eye-imaging hardware, oxygen and nitrogen tanks | Mission-specific totals reported for the April 11, 2026 launch and subsequent station unloading |
The different totals do not mean one spacecraft always carries more than the other. Cargo mass changes with the number and type of investigations, available stowage, consumables, return requirements and the station’s schedule.
Science experiments delivered by Dragon CRS-34
NASA’s May 2026 reports show how one flight can combine basic science, health research and Earth observation.
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Testing ground-based microgravity simulators
One project assessed how well Earth-based simulators reproduce microgravity conditions. Such validation matters because investigators use simulated environments to screen procedures and materials before committing them to an orbital experiment. The flight therefore carried an investigation designed to judge the usefulness and limits of those simulations.
Wood-based scaffold for bone research
Dragon delivered a wood-based bone-scaffold investigation. The scaffold is intended to help researchers study bone growth or repair in a setting where microgravity changes how cells and tissues behave. NASA noted a possible connection to fragile-bone conditions on Earth. That is a research objective, not a claim that the flight produced a finished treatment.
Red-blood-cell and spleen studies
Other hardware examined changes in red blood cells and the spleen. Human physiology adapts to spaceflight, and investigations of blood-cell behavior can help clarify those adaptations. The cargo therefore included the equipment needed to collect, process or analyze biological material rather than merely shipping a finished product.
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Charged particles, planet formation and reflected light
A separate instrument studied charged particles around Earth, contributing measurements of the near-Earth space environment. Another investigation addressed processes related to planet formation. NASA also listed an instrument that measures sunlight reflected by Earth and the Moon. Together, these payloads demonstrate that an ISS manifest can span human biology, space physics, planetary science and observational measurements on one vehicle.
Science experiments delivered by Cygnus CRS-24
Quantum-science hardware
Cygnus XL carried a quantum-science module. Quantum experiments often require tightly controlled hardware and procedures because small disturbances can affect the result. The cargo vehicle’s role is to transport that module safely; the station crew then installs or activates it according to the investigation plan.
Stem-cell production for blood diseases and cancer research
NASA highlighted hardware intended to produce more therapeutic stem cells for research involving blood diseases and cancer. Microgravity can alter cell growth and organization, allowing investigators to test production methods that are difficult to reproduce on Earth. The manifest includes not only biological materials but also the production hardware, containers and operating supplies needed in orbit.
Gut-microbiome model organisms
Model organisms were sent for research on the gut microbiome. In this type of investigation, the organisms, food or growth medium, containment equipment and sampling materials must arrive in a condition that preserves the planned experiment. Their presence shows why a “science payload” can be a living system plus a small laboratory rather than a single instrument.
Space-weather receiver
A receiver designed to improve space-weather models was another Cygnus payload. Better measurements of the space environment can support predictions about conditions that affect spacecraft systems and operations. The receiver is an example of an instrument whose value comes from long-term data collection after installation.
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Why freezers, incubators and transfer hardware travel with the experiments
Research cargo often has a strict chain of custody. A sample can be scientifically useless if it warms up, freezes unexpectedly, loses sterility or remains in transit too long. For CRS-24, NASA reported that crew members moved time-sensitive samples from portable spacecraft freezers into the station’s MELFI freezers and MERLIN incubators.
- Launch and transport: Samples or biological materials are packed in approved containers, with the temperature control required for the investigation.
- Capture and installation: Canadarm2 captures the arriving Cygnus and positions it for attachment to the station.
- Inventory and transfer: Crew members unload the vehicle and identify time-sensitive items according to the cargo plan.
- Preservation or activation: Samples move to MELFI freezers, MERLIN incubators or another designated facility; hardware is installed where the experiment will run.
- Operations and sampling: The crew follows procedures for powering instruments, feeding model organisms, collecting samples or changing experiment settings.
This process explains why a manifest may list a freezer, incubator or transfer container alongside the experiment itself. The support equipment is part of delivering a usable result.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which spacecraft carry cargo to the ISS?
NASA’s ISS facts material identifies four cargo spacecraft serving the station: Northrop Grumman’s Cygnus, SpaceX’s Dragon, JAXA’s HTV and Russia’s Progress. NASA’s 2025 research retrospective also described HTV-X1 and Cygnus XL as vehicles visiting the station that year. Vehicle availability and schedules can change, so a current mission release is the appropriate source for a particular flight.
The vehicle affects how a payload is packed, delivered, unloaded and sometimes returned. A pressurized module can carry crew supplies and laboratory hardware inside the station’s habitable environment. External payloads may require a different attachment point and robotic handling. Return-capable cargo also changes the plan because investigators may need to bring samples back to Earth rather than consume or discard them in orbit.
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Payload developers do not manifest directly with the launch provider for transport to the ISS, according to NASA’s researcher guide. The ISS Program assigns accepted payloads to an appropriate vehicle and mission. That allocation reflects safety reviews, power and volume needs, temperature limits, crew time, communications, installation location, launch readiness and return or disposal requirements.
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In practice, a research team must supply more than an interesting idea. Its payload has to meet station interface requirements, survive launch, fit the assigned vehicle, operate with available resources and have procedures the crew can execute. A time-sensitive biological investigation may receive priority on a flight that can preserve it, while a large instrument may wait for a mission with the right internal or external accommodation.
How to interpret cargo weights and manifests
- Read the mission name and date: “About 6,500 pounds” refers to Dragon CRS-34 in NASA’s 2026 reports, not to every Dragon flight.
- Check what is included: One report may say “science investigations, supplies and equipment,” while another emphasizes “food, supplies and equipment.” The wording defines the scope of the total.
- Do not infer maximum capacity: A 6,500-pound or 11,000-pound mission total does not establish the spacecraft’s maximum cargo capability.
- Separate research from support hardware: A reported research total may exclude food, tanks, exercise equipment or packaging, depending on the mission report.
- Expect manifests to change: Investigations can be delayed, replaced or resequenced when hardware, safety approval or launch timing changes.
What a cargo manifest cannot tell you by itself
A short list of payload names does not reveal how long an experiment will run, whether it will return to Earth, what results it will produce or whether a medical application will follow. For example, a bone scaffold investigation may inform future fragile-bone research without becoming a clinical treatment. A space-weather receiver may improve models only after it supplies a substantial data set. The manifest identifies what was delivered; it is not a results paper.
Likewise, the presence of food, water containers or clothing does not imply that a mission was primarily a crew-provision flight. Cargo vehicles commonly combine routine logistics and research in the same launch. NASA reported that more than 750 experiments supported exploration missions, improved life on Earth and opened commercial opportunities in low Earth orbit during 2025, but that is a station-wide annual figure, not the output of one cargo spacecraft.
A concise way to picture an ISS cargo spacecraft
Imagine opening a vehicle after docking: one section contains meals, hygiene items and clothing; another holds replacement parts, tools and gases; a protected rack contains a quantum module or a cell-production system; a freezer contains samples that must be transferred immediately; and separate containers hold sensors, model organisms or materials for an investigation. That mixture is normal. The cargo spacecraft is simultaneously a pantry, warehouse, laboratory supply truck and cold-chain carrier for an orbital research station.
The most accurate answer to what it carries is therefore “whatever that mission’s crew, station and investigators need,” illustrated by the concrete Dragon CRS-34 and Cygnus CRS-24 examples above. To identify a current flight’s exact contents, use the NASA mission release for that vehicle and date rather than treating an older manifest as a permanent template.
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