The short answer
There is no household box that takes a 9 ft tree's sections. The longest rigid interior we have measured is 30 1/2 inches, and a 9 ft tree's longest piece is 40 to 50. If you want rigidity, buy the container with a steel frame under the fabric: the expandable dolly publishes 60 to 72 inches of length and four wheels. If you want a box because a bag got crushed, put the bag on top of the stack instead of under it, and buy the 65-inch bag.
The number that ends the search
People search for a tree storage box for a specific, sensible reason: a fabric bag on a garage floor gets things stacked on it, and a stacked bag is a crushed tree. So they go looking for something rigid, sized to the tree. The search fails on one figure, and it is better to see the figure than to keep shopping.
Longest branch section by tree height, against the longest rigid interiors we have measured| Tree height | Typical longest section | Longest rigid interior here | Fits a box? |
|---|
| 4 to 5 ft | Under 20 in | 20 1/8" (27 gal Stacker) | Yes |
| 6 to 6.5 ft | 28 to 34 in | 30 1/2" (40 gal wheeled) | Sometimes; measure |
| 7.5 ft | 34 to 40 in | 30 1/2" | No |
| 9 ft | 40 to 50 in | 30 1/2" | No |
| 12 ft | Up to 60 in and more | 30 1/2" | No |
Those section figures are typical rather than universal — a tree that splits into four pieces has shorter sections than one that splits into two — and the full method for measuring your own is on the tree height to bag length table. But the gap between a 30-inch bin and a 40-inch pole is not one that measuring closes. A full-size artificial tree is a long thin load and a bin is a short deep one.
What is sold as a tree storage box
Most products with “box” in the title are fabric bags with board or cardboard inserts that hold a rectangular shape when empty. They are useful, they are not rigid in the sense a bin is rigid, and they do not take a stack any better than a bag does. The ones that publish a fabric weight are ranked with the bags on the tree storage ranking.
The genuinely rigid tree containers are rare and large, and the one format that combines rigidity with the length a tree needs is a bag built on a frame. That is the expandable dolly: a full-length steel frame under 300D fabric, four wheels including two metal casters, and a top that expands from 60 to 72 inches. The frame carries the load instead of the cloth, which is the only sense in which any tree container is a “box.”
What each container actually takes
The containers on this page, on published interior length| Container | Published interior length | Takes a 7.5 ft tree | Takes a 9 ft tree | Rigid? |
|---|
| Expandable Tree Storage Dolly | 60" to 72" | Yes | Yes | Steel frame |
| Zober 600D tree bag | 65" | Yes | Yes | No |
| Sterilite 40 Gal Wheeled Industrial | 30 1/2" | No | No | Yes |
| Sterilite 27 Gal Stacker | 20 1/8" | No | No | Yes |
The two rigid bins on this page are here to show the ceiling, not to be bought for the tree. The 40-gallon wheeled tote is the longest interior we have found in the category and it is still ten inches short of a 7.5 ft tree's bottom section. What it is excellent for is everything around the tree: the stand, the skirt, the collar hardware, the lights, all of which are the right shape for a bin and the wrong shape for a tree bag.
Solving the crush problem without a box
The reason for wanting a box is sound, so here is how to get what the box would have done.
Put the bag on top. If you already own bins for the rest of the decorations, the tree bag goes on top of the stack, not under it. The bins take the load; the bag takes nothing. This costs nothing and removes the entire crush question for a shelf or a stack.
Or put a frame under it. If the bag has to sit on a garage floor where things get dropped on it, the dolly is the container whose durability does not depend on cloth. It is the most expensive thing in the tree category by a wide margin and it is the only honest answer to “rigid and long.” The full durability comparison is on the best heavy-duty tree storage bags.
Or split the storage. A rare third option: some trees split into sections short enough that the bottom one is the only piece over 30 inches. Two bins for the short sections and a small bag for the long one is inelegant and it works, and it is worth measuring for before buying anything.
Where a box genuinely is the answer
For a 4 to 5 ft tree, ignore everything above: its sections are under 20 inches and a 27-gallon Stacker publishing 20 1/8 by 14 1/8 by 18 7/8 inches takes them with room for the stand. That is a better container than any bag for a small tree, because it stacks and resists crushing and costs about the same. The interiors of every bin we rank are on holiday storage containers by capacity.
For a 6 to 6.5 ft tree it depends on the tree. Some split short enough for the 40-gallon wheeled tote's 30 1/2 inches; many do not. Measure the longest piece before buying, and if it is within an inch of 30, it will not close once the branches spring outward.
This page answers the sizing question. The format question — what a bag gives up and what a rigid container gives up, for a tree that does fit both — is on Christmas tree storage bag versus box, and if the real question is whether to buy a bag at all, are tree storage bags worth it takes that one.
What we cannot tell you
The section lengths by tree height are typical figures from the trees we have measured listings for, not a standard, and your tree is the only one that counts. Every container figure is the maker's own and linked below. We have not loaded a tree into any of them; the method and its limits are at how we pick.