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Strung in a garden, not a gym

ninja line: two trees, one strap and a summer of climbing

Pick the length that suits the gap between your trees, clip each station where you like it, and the lawn becomes a course the same afternoon.

See the complete linesWhich one fits my garden ↓
  • 5 things we make
  • 3 shelves
  • 179 ratings on the listings
  • 4.5 average stars

How long is the gap between your trees?

The 10-Station Line, 2x56 ft by ninja line — set up between two trees

The 10-Station Line, 2x56 ft

Ten obstacles on two 56-foot straps — the kit most yards actually have room for.

4.4 (124 ratings) $99.99In stock

The shelves

Three places to start

A whole line, one extra climb, or something for indoors once the straps are back in the bag.

Children hanging from a ninja line strung across a garden lawnBetween Two TreesTwo straps and a row of handholds, ready for the trees.2 items · from $99.99A child working up the yellow ninja line cargo net in a backyardAdd A StationOne more climb for the line you already strung.1 item · from $35.99Friends around a table with clear ninja line mahjong racksOff The LineFor hands that keep busy after the straps come down.2 items · from $15.99

Most rated

What people rate most

Sorted by how many people rated each piece on its listing. The two complete lines share one pool of ratings, so they show up once.

Side by side

Every ninja line piece, compared

What hangs, how far it spans, what it is made of, who it suits and what it costs, all in one view.

Every ninja line piece, compared
ItemWhat hangsSpan / sizeMade ofAgesRatingPriceBuy
The 14-Station Line, 2x65 ft by ninja line — set up between two treesThe 14-Station Line, 2x65 ft14 stations2 x 65 ftAlloy steel, polyester webbing5+ with an adult4.4 (124)$149.99 In stock
The 10-Station Line, 2x56 ft by ninja line — set up between two treesThe 10-Station Line, 2x56 ft10 stations2 x 56 ftAlloy steel, polyester webbing5+ with an adult4.4 (124)$99.99 In stock
Butter Stick Squishy Toys, 2-Pack by ninja line — set up between two treesButter Stick Squishy Toys, 2-Pack25.51 x 1.57 x 1.57 inSoft PU foam3+4.8 (44)$15.99 Back shortly
Climbing Cargo Net and Rope Ladder by ninja line — set up between two treesClimbing Cargo Net and Rope Ladder1 obstacleNot listedPolyester webbing5+ with an adult4.4 (8)$35.99 Only a few left
Clear Acrylic Mahjong Racks with Pushers, 4-Pack by ninja line — set up between two treesClear Acrylic Mahjong Racks with Pushers, 4-Pack4 racks with pushersNot listedClear acrylicNot listed5.0 (3)$27.99 Only a few left

The 56 ft and 65 ft lines share a single pool of ratings on the listing, which is why their stars and counts match. Price and stock are as last checked; the listing itself always has the latest.

Find your fit

Which one suits your garden

Start from the situation you are actually in. Each card points to the one piece that answers it.

  1. A gap a 56-foot strap can cross, two younger climbers

    The shorter line is the one most gardens have room for, and ten stations keep two climbers busy taking turns.

    The 10-Station Line, 2x56 ft by ninja line — set up between two treesThe 10-Station Line, 2x56 ft$99.99 · In stock

  2. A long run and a crowd of cousins every weekend

    Fourteen stations on two 65-foot straps means the queue for the rings never gets long. Take the long kit if the trees allow it.

    The 14-Station Line, 2x65 ft by ninja line — set up between two treesThe 14-Station Line, 2x65 ft$149.99 · In stock

  3. They cleared the whole line inside a week

    Clip the cargo net into the middle of the run. A net slows them down and makes them think about feet as well as hands.

    Climbing Cargo Net and Rope Ladder by ninja line — set up between two treesClimbing Cargo Net and Rope Ladder$35.99 · Only a few left

  4. No pair of trees, but a sturdy beam or a climbing frame

    The net hangs from its corner loops, so a beam, a branch or a jungle gym does the job a strap would.

    Climbing Cargo Net and Rope Ladder by ninja line — set up between two treesClimbing Cargo Net and Rope Ladder$35.99 · Only a few left

  5. Rain on the window and restless hands indoors

    The butter stick squishies rise back slowly after every squeeze, which is the right pace for a stuck-inside afternoon.

    Butter Stick Squishy Toys, 2-Pack by ninja line — set up between two treesButter Stick Squishy Toys, 2-Pack$15.99 · Back shortly

  6. Mahjong night, and one rack that keeps sliding off

    Four clear racks with the pushers built in and a non-slip base. Nothing to put together before the first hand.

    Clear Acrylic Mahjong Racks with Pushers, 4-Pack by ninja line — set up between two treesClear Acrylic Mahjong Racks with Pushers, 4-Pack$27.99 · Only a few left

Two things worth knowing

How the run works

Nothing on the strap is bolted down

Every ring, bar, ladder and fist rides on a carabiner that slides. Crowd them together and the run becomes a grip test; spread them out and a five-year-old can cross the whole thing without stopping. We never print a recommended order, because the order is the game.

The low strap is the one they keep coming back to

Both of our kits ship with a second line that carries no obstacles at all. It sits near the grass and does nothing but wobble. It looks like the boring half of the kit, and it is the half that gets used on an ordinary Tuesday.

Written by the people who rigged it

Six write-ups from the gardens it went up in

Every word below came from somebody who actually strung one of these between two trees, typos and all.

4.8out of 5 across the write-ups below
  • 5★5
  • 4★1
  • 3★0
  • 2★0
  • 1★0

★★★★★

Wonderful for Multiple Ages

I have five kids ranging from 1 to 8 years old. I bought this for them to have another activity outside. All of my kids love to climb and are very active. And they all LOVE this ninja course. I installed this by myself. It took me a little while to put together but I was able to figure it out. Definitely would be easier to put together with two adults. It seems very sturdy and holds all of my kids very well. My kids have hours of fun on this and play on it every day. I definitely would recommend if you have room for this in your yard. I’m very happy with my purchase.

★★★★★

Great way to keep kids active! Very well built.

Absolutely love. Got for a Christmas gift and it is such a good value for the money. Very easy to install with two people. The pieces and straps are built very well and sit has been a hit for all the kids. I like that you can add pieces if you have a long run which makes it very functional. Fun for all kids!

★★★★★

Tough and durable

Great slack line. All obstacles have lasted well against weather and crowds of kids playing on them. If there was a bad thing to mention it is that where the base slack line touches and wears on the trees it will eventually cut through the slack line and break. Ive bought 2 slack lines in the past year. Just ve sure to use the cover that hugs the tree to reduce friction and wear

★★★★★

Clear Acrylic Looks Beautiful

The transparent acrylic design is my favorite part. These racks have a clean, modern look and match well with different Mahjong mats and tables. They feel lightweight but stable, and the non-slip pads help keep them from moving around while playing.

★★★★☆

More unique than your typical butter squishie.

Squishies are ALL the rage right now! My kids are constantly collecting and trading these, so I wanted to get them something unique. I like these variations because they are basically stress balls, the kids just don't know it. These are made of a foam like material instead of those water / gel filled ones that kids are getting hurt with. These are VERY slow rise, if you are impatient, it can be almost annoying how very slow these are so just keep that in mind. I wouldn't say that necessarily a bad thing it just depends on what you, personally, are looking for. Overall I like them, decent value, great for kids or adults.

Plain dealing

What you can count on here

  • Numbers from the listingEach price, rating and stock note on this site is taken from our product listings, not typed in by hand.
  • Orders and returns at the storeYou check out with the partner store that ships the kit, so delivery and returns are handled there, on your own order page.
  • Same hardware on both linesThe 56 ft and 65 ft lines are both built around 880 lb alloy steel hardware; the shorter kit is not a lighter build.
  • A real addressTwo Trees Outfitting Co., 2140 Dundas Street, Suite 7, Eugene, OR 97403. Write to [email protected] with anything about rigging a line.

What a ninja line actually is

A ninja line is a strap you tension between two anchors so that kids have something overhead to hang from. Ours goes up in a backyard in about ten minutes: two trees, two ratchets, and a row of rings, bars and a rope ladder clipped along the top. Nothing is fixed, so the course changes shape every week and the fun does not run out in August.

We started making this because our own children had worn a path around the sofa. Outdoor life gets easier when there is a swing at head height and a line to cross, and a strap between two trees is the cheapest way we know to put one there.

Pick the gap in your garden, pick the length that fits it, and let the rest be worked out by whoever is hanging upside down at the time.

Asked at the fence

Questions we get asked over the fence

How much weight can a ninja line hold?

Both of our kits are built around 880 lb hardware — alloy steel components with an anti-rust finish, and polyester webbing rated to match. That number is not about adults joining in. A child who drops onto a ring pulls several times their own weight for a fraction of a second, and the margin is there to absorb it.

How do you hang a ninja line without trees?

Any two solid, immovable uprights will do: 4x4 posts set in concrete, the corner posts of a sturdy swing frame, a carport beam. What matters is that the anchor cannot lean. Fences, washing lines and single-skin sheds are not anchors — a tensioned strap pulls far harder sideways than people expect.

What is a ninja slackline?

It is the same idea borrowed from slacklining: a flat webbing strap tensioned with a ratchet. The difference is what goes on it. A slackline is for walking; a ninja line carries obstacles, so it is hung higher and used hand over hand instead of underfoot.

Is slacklining still a thing?

In backyards, more than ever. The walking line never went away, but it picked up a second life once people started hanging rings and bars from it. Most of the families we hear from bought the kit for the obstacles and ended up using the balance strap just as much.

Field notes

Before the straps go up

Taking it down

When the season turns

Webbing dies slowly and invisibly. Twenty minutes in autumn buys you another summer.

All field notes →