CapabilitiesStorage
Mount outside storage
Attach an S3-style bucket or another outside filesystem as a folder.
Short answer: 4 of 16 providers offer it fully: Cloudflare Sandbox, Daytona, Modal and Runtime. With a catch: E2B. Checked 29 October 2026.
Who offers it
Part of Storage: disk, volumes and what persists, which explains why it matters.
Fully: Cloudflare Sandbox, Daytona, Modal and Runtime. With a catch: E2B. Not at all: Agent 37, Blaxel, Boat, boxd, InstaBox, Lizard, Morph, Sandboxer, Sprites, Tensorlake and Vercel Sandbox.
Mount one prefix of a bucket as a folder with s3fs.
docs-confirmed “The `S3Mount` class from `@cloudflare/sandbox` mounts one prefix of a bucket as a directory with `s3fs`.” Source
- DaytonaYes
The docs walk through mounting an S3, R2 or Tigris bucket.
docs-confirmed “Mount an Amazon S3 bucket” Source
- ModalYes
Mounted with Mountpoint for S3, which has its own limitations.
docs-confirmed “It supports AWS S3, Cloudflare R2, and Google Cloud Storage buckets.” Source
- RuntimeYes
The sandbox never holds the bucket's keys.
docs-confirmed “You can mount your own buckets inside a sandbox, and the sandbox never holds their keys.” Source
- E2BWith a catch
The catch: Mounting a bucket needs a custom template with the right filesystem tool installed; it is not built in.
docs-confirmed “You will need to create a custom sandbox template with the FUSE file system installed.” Source
- Agent 37No
Only the instance’s own disk can be mounted; no outside bucket.
inferred “The folder the instance’s disk is mounted at, and the one folder an `update` keeps.” Source
- BlaxelNo
The docs say external storage such as S3 buckets cannot be mounted.
docs-confirmed “Blaxel also does not support mounting external storage (such as S3 buckets) as volumes.” Source
- BoatNo
No outside bucket or filesystem can be mounted.
inferred ““Disk” is the maximum size of your own files.” Source
- boxdNo
No outside bucket or filesystem can be mounted; backups go to object storage, they are not mounted from it.
inferred “A disk is standalone storage that outlives the machine it is attached to.” Source
- InstaBoxNo
No outside bucket can be mounted.
inferred “A machine has one disk, `/data` (home is `/data/home`), 20 GiB by default.” Source
- LizardNo
The S3 addon is reached with an SDK, not mounted as a folder.
docs-confirmed “Use them with any AWS SDK and path-style addressing.” Source
- MorphNo
Volumes are reached with an S3 client; mounting an outside bucket is not documented.
inferred “They use your existing Morph API key, so you can use the web console, the `morphcloud volumes` CLI, the Python `MorphCloudClient().volumes` helpers, or any standard S3 client against the same gateway.” Source
No outside bucket can be mounted.
inferred “"Disk" is space for your files, added on top of the OS image” Source
- SpritesNo
No outside bucket can be mounted.
inferred “The split is simple: disk persists, memory does not.” Source
The mount feature covers Tensorlake's own file systems; an outside S3 bucket is not documented.
inferred “Mount durable, shareable Tensorlake filesystems into sandboxes at boot, on warm-pool claims, or on a running sandbox” Source
Drives are Vercel storage; mounting an outside bucket is not documented.
inferred “Drives are mounted as read-write by default.” Source
Related
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