Est. 2026  /  Aquatic Companion Systems Cabin Approved  ·  Free Overnight Water

STILLWATER
Certified Emotional Support Enclosures for Fish Who Travel


The Companion Line, Vol. I

Your fish has feelings.
Now it has a boarding pass.

Hermetically sealed, pressure regulated, cabin legal. A private ocean you can carry through security and stow beneath the seat in front of you.

The Meridian, shown with resident rainbow trout. Companion sold separately.
◆ TSA Familiar◆ 14-Hour Life Support◆ Whisper-Grade Filtration◆ Fits Under the Seat◆ No Sloshing, No Judgment◆ Certified Companion Program◆ TSA Familiar◆ 14-Hour Life Support◆ Whisper-Grade Filtration◆ Fits Under the Seat◆ No Sloshing, No Judgment◆ Certified Companion Program

The Collection

Six enclosures / one temperament each
Bestseller
No. 01

The Emo Trout

for the melancholic rainbow trout

Matte anthracite shell for the fish that feels everything a little too deeply. Dimmable interior lighting for the days it just needs to be seen.

  • Volume18 L
  • Occupant lengthto 40 cm
  • FiltrationSilent triple-stage
  • Runtime14 hrs
$1,240Cabin Legal
No. 02

Rainbow Salmon

for the migratory optimist

Iridescent double-wall glass that catches terminal skylights beautifully. Built for a fish that has swum upstream its whole life and is not about to check a bag.

  • Volume34 L
  • Occupant lengthto 70 cm
  • FiltrationSaltwater capable
  • Runtime16 hrs
$2,180Cabin Legal
New
No. 03

Bass Anxiety

for the highly strung largemouth

Reinforced, opaque calming panels and a low-vibration pump for the companion that startles at the beverage cart. Noise-dampened to airport-lounge quiet.

  • Volume26 L
  • Occupant lengthto 55 cm
  • FiltrationAnti-stress carbon
  • Runtime15 hrs
$1,690Cabin Legal
No. 04

My Betta Half

for the devoted, dramatic betta

Our compact personal enclosure. Small enough for the seatback pocket, temperature-locked for the tropical companion who considers itself the main character.

  • Volume4 L
  • Occupant lengthto 8 cm
  • FiltrationMicro-current
  • Runtime20 hrs
$540Carry-On
No. 05

Zen Koi

for the enlightened pond retiree

Wide-body serenity vessel with a garden-view portal. For the koi that has made peace with everything except turbulence over the Rockies.

  • Volume48 L
  • Occupant lengthto 80 cm
  • FiltrationKoi-grade bio
  • Runtime18 hrs
$2,760Cabin Legal
Flagship
No. 06

Sole Companion

for the flatfish who travels alone

A low, wide horizon enclosure for bottom-dwellers, with a sand-textured floor and side-mounted eyes in mind. Because nobody should fly solo. Not even a sole.

  • Volume30 L
  • Occupant lengthto 45 cm
  • FiltrationBenthic gentle-flow
  • Runtime17 hrs
$1,980Cabin Legal
The Octet, No. 07. Eight independent glass arms, one for every arm. Shown occupied.
Limited Edition  /  100 sealed worldwide

The Octet

Most companions ask for one ocean. An octopus asks for eight. So we gave it eight, each arm a separately filtered glass channel radiating from a central serenity dome, so an emotional support octopus can stretch out, hold on, and change its mind mid-flight.

  • Configuration8 glass arms + dome
  • Volume62 L combined
  • Occupant reachto 1.4 m
  • FiltrationEight-channel independent
  • Runtime22 hrs
  • Escape ratingDetermined-cephalopod grade

In the wild

Companions, photographed at altitude-adjacent
The Emo TroutTraveler carrying a rainbow trout in a cylindrical enclosure at gate B44
The Emo TroutGate B44, boarding with the melancholy in tow
The OctetTraveler holding an octopus in a dome enclosure with eight glass arms
The OctetEight glass arms, eight declared items
The ShellterTraveler wearing a turtle enclosure as a chest-mounted personal item
The ShellterWorn forward, personal-item legal
Claws for ConcernTraveler holding a crab in a domed enclosure
Claws for ConcernThe emotional support crab, side-stepping through
The MeridianTraveler with headphones holding a trout in a cylindrical enclosure
The MeridianNoise-cancelled, resident trout unbothered
The Long HaulTraveler holding a soft-shell turtle in a cylindrical enclosure
The Long HaulSoft-shell terrapin, built for the connection through Denver
Jelly NervesTraveler holding a jellyfish in a bell-dome enclosure
Jelly NervesThe bell-dome drifter, no spine, no problem
Hold Your SeahorsesTraveler in a Hawaiian shirt with a backpack enclosure of seahorses
Hold Your SeahorsesThe herd, backpack-mounted, off to somewhere warm
Current MoodTraveler holding an eel in a long cylindrical enclosure at gate A34
Current MoodThe emotional support eel, Gate A34
The Fitting Room

Configure your companion

Tell us about your fish. We build the private ocean around its temperament, not the other way around.

01  /  Choose an enclosure
The Emo Trout Rainbow Salmon Bass Anxiety My Betta Half Zen Koi Sole Companion
02  /  Water profile
Freshwater Saltwater Tropical (heated)
03  /  Comfort upgrades
Dimmable mood light Extended 24hr battery Monogrammed handle In-tank ambient audio Privacy calming panels
04  /  Certification
Standard companion card Laminated boarding letter Frequent-swimmer status

Life support, quietly

Engineering / the boring parts that keep it alive
14h
Sealed runtime on a single charge. Longer than most connections through Chicago.
28dB
Filtration hum, roughly a library. Quieter than the person reclining into your knees.
±0.5°
Temperature stability, cabin to jet bridge to baggage-claim reunion.
100%
Sealed against sloshing, spilling, and the raised eyebrow of a gate agent.

From the owners

Verified companions
★★★★★

Luna hasn’t missed a flight since. She gets the window, obviously.

D. Halvorsen · The Meridian
★★★★★

My betta finally feels seen at cruising altitude. We are both healing.

P. Okafor · My Betta Half
★★★★☆

The Bass Anxiety panels saved us both during descent. Docked a star; he still hates the seatbelt sign.

R. Vance · Bass Anxiety

Before you board

The questions gate agents also have
Will they actually let a fish on the plane?

Emotional support animal policy is set by each airline and has tightened considerably in recent years. STILLWATER makes the enclosure, not the rules. We strongly recommend calling ahead, arriving early, and radiating the calm confidence of someone who absolutely belongs there with a trout.

Does the fish count as a carry-on or a personal item?

The enclosure is engineered to the personal-item envelope and fits beneath the seat in front of you. Your companion, per its own preference, considers itself first class.

What happens at the security scanner?

The vessel is TSA-familiar in shape and fully sealed. Water over 100ml is, we are aware, a conversation. We include a printed care card so the officer understands this is a life-support system and not a very committed smoothie.

How long can my companion stay sealed?

Up to 14 hours on standard battery, 24 with the extended cell. Oxygen, filtration, and temperature are held automatically. You will need snacks before your fish does.

Is this real?

This is a concept. It is a love letter to one man, one trout named Luna, and the beautiful idea that our anxieties deserve to travel with us. No fish were boarded, ticketed, or upgraded in the making of this page.