An aquarium starter kit is the hardest kind of carton to size, because it is not one product. It is a tank, a pump or filter, a light or hood, tubing, a bag of substrate, water treatment bottles and a printed guide, all of which have to travel together without the glass taking the load. You size it from the layout out.
Build the layout before you pick a number
Put every component on a table in the arrangement you intend to ship, with the dividers, trays or bags in place. Then measure the whole assembled block at its widest, longest and tallest. That block, plus clearance, is your internal cavity. Working from a parts list and adding up dimensions will always be wrong, because components nest.
- Decide what sits inside the tank. Most kits use the tank's own volume for the smaller accessories, which is free space you would otherwise pay to ship as air.
- Decide what must be isolated. Liquids need to be separated from printed material and from anything they would ruin if a cap loosened.
- Decide what carries the load. The stack should rest on a divider or a platform, never directly on glass.
- Measure the block, then add clearance for the corner protection or end caps.
Board build for a mixed, heavy load
A kit carton has to resist puncture from hard edges inside and hold stacking strength through a warehouse. Double wall is the normal answer. BC double wall is commonly cited near 9/32 in (about 7 mm) caliper as an industry-typical figure, and you add one caliper at each wall to get from your internal cavity to the external carton. That difference matters here because kit cartons are large: over a 48 x 40 in pallet footprint, half an inch of unnecessary width per carton can cost you a whole column.
Dimensional weight is the hidden cost
Large, relatively light cartons are usually rated on dimensional weight rather than actual weight, which means the volume of your box, not its mass, sets the freight bill. US parcel carriers publish their own dimensional divisors and they change, so check your own carrier agreement rather than a number you read somewhere. The practical consequence is simple: every inch of empty air inside the carton is a recurring cost on every unit you ever ship. It is worth spending an afternoon rearranging components to lose an inch of depth.
Ordering
Minimum order is 100 boxes. Price starts from about $0.48 per unit at bulk volumes and is confirmed on your written quote, since a large printed double wall carton with internal dividers is a different build from a plain shipper. The cutting die, the plates for the print, design support, US shipping and a digital proof before anything prints are included. Dividers and platforms are tooled the same way, so ask for them to be quoted as part of the kit rather than sourced separately.
Production comes from West Chicago in the US and Guangzhou in China in three lanes: rush is expedited production plus air freight at a premium of about 7 to 25% depending on the job, standard moves by air, cost saver moves by sea. The floor is from about 7 business days, plus 2 to 5 for delivery, and specialty imported items can run up to about 12 weeks.
To order, see custom aquarium product boxes. Before you settle the board, what C flute corrugated is explains the single wall option and when it is genuinely enough. Photograph your component layout with a tape measure in frame, send it through the quote form, and ask for a dieline that includes the dividers.
