Packaging guide
Bath Bomb and Bath Salt Packaging Guide
Box sizes by mould, windows, inserts and board choices that keep bath bombs whole and bath salts dry.
Why are bath bombs and salts hard to package?
A bath bomb is pressed powder held together by very little.
Knock it and it chips; let it rub against a neighbour and the surface goes dull; let damp air at it and it starts to fizz in the box. Bath salts have the opposite problem: they draw moisture, clump and leak through any gap.
The packaging job is therefore three jobs. Hold each item still. Keep air and damp out, or at least slow them down. And show the product, because colour is what sells both.
This guide works through sizes, windows, inserts, mailers and displays, with the numbers makers ask about most.
What size box does each bath bomb mould need?
Most makers press in four mould sizes: 45, 55, 65 and 75 mm.
The box is the mould diameter plus 4 to 5 mm on each axis, so the bomb sits without rolling but is not squeezed. Pressed bombs are often a millimetre or two over the mould size, so measure a trimmed bomb rather than trusting the mould.
Single boxes are cubes. For sets, the bombs sit in a line or a grid with a cell wall or a divider between them. The table gives inside sizes for the common counts.
| Bomb size | Typical weight | Single box | Set of 3 in a row | Set of 4 in a grid |
|---|---|---|---|---|
| 45 mm | 60 to 80 g | 50 x 50 x 50 mm | 155 x 50 x 50 mm | 105 x 105 x 50 mm |
| 55 mm | 100 to 130 g | 60 x 60 x 60 mm | 185 x 60 x 60 mm | 125 x 125 x 60 mm |
| 65 mm | 160 to 200 g | 70 x 70 x 70 mm | 215 x 70 x 70 mm | 145 x 145 x 70 mm |
| 75 mm | 230 to 280 g | 80 x 80 x 80 mm | 245 x 80 x 80 mm | 165 x 165 x 80 mm |
Should a bath bomb box have a window?
For a shelf, yes.
A bomb with a two-colour swirl sells on sight, and a window over most of the front face does the work. The bath bomb window boxes with a front cut-out are the standard version, with the window cut to the bomb's diameter.
The open question is film. An open window lets scent out, which some makers want on a market stall, and lets damp in, which nobody wants over weeks in a shop. A clear film glued behind the window keeps dust and moisture off and is priced as an option.
For bombs sold online only, leave the window out. The box sits inside a parcel and the extra cut weakens the panel for no gain.
How do you keep bath bombs from chipping in the post?
A cell per bomb.
If two bombs can touch, they will, and the contact point rubs smooth. Card inserts punched with one round hole per bomb, or a folded divider that makes a grid, keep them apart. Crinkle paper fill does the same job more loosely and suits sets that change.
Then headroom. Leave 3 to 5 mm above the bomb so the lid does not press on it, and no more, so it cannot bounce. A shrink wrap or a tissue wrap on each bomb adds a second layer and holds loose powder.
Finally the outer. A printed box is not a shipping box. Put it inside a padded mailer or a small corrugated carton with 20 mm of fill around it. The tuck-flap mailer boxes for bath bombs are the inner layer built for this.
Which board and finish suit bath bomb boxes?
Kraft folding board is the default for bath bombs, because it looks handmade and prints well in one or two colours.
White folding boxboard at 350 to 400 gsm takes full colour and suits brighter brands. Both are options on request, as are heavier boards for display trays.
Finish is where bath packaging differs from skincare. Scented oils in a bomb can mark an uncoated board over time, so a matt lamination is worth having on white boxes that will sit on a shelf. Kraft is usually left uncoated, which suits the look.
Foil and spot UV are rare here and rarely needed. The product is the colour. Spend the finish budget on a window film and an insert instead.
What box keeps bath salts dry?
Salts need a sealed bag inside a box, not a box alone.
A heat-sealed clear or foil bag holds the salt; the box carries the print and the window. Size the box with 3 to 5 mm of room around the filled bag so it slides in without stressing the seams.
A 350 g fill of coarse salt takes a bag about 70 x 50 x 110 mm when settled, so a box of 80 x 60 x 120 mm suits it. A 500 g fill moves up to about 90 x 65 x 140 mm. Gable-top cartons with a carry handle are the common shape, with a window on the front.
The gable-top bath salt boxes take full colour print well, which suits a photo of the botanicals or a flat colour that matches the salt.
How does a counter display sell bath bombs?
A display tray is shallow, with one cell per bomb and a header card standing behind.
Flat in the parcel, it folds up in under a minute and holds eight to twelve bombs at the till. Customers pick from it and the box underneath is the only packaging.
Size the cells to the bomb plus 5 mm. For 55 mm bombs a 3 x 4 grid is about 260 x 200 mm with a header at 100 mm tall. Heavier board, or a double-layer base, stops a full tray sagging in the middle.
Pair the display with a small single box or a sleeve, so a customer who picks a bomb from the tray has something branded to carry it in.
How do you order bath bomb or bath salt boxes?
The steps below take a maker from mould to delivered boxes.
Most orders cover two or three items at once: a single box, a set box and either a mailer or a display.
- Measure a trimmed bomb, or a settled filled salt bag, at its widest and tallest point.
- Work out the selling point: shelf, stall, parcel or counter display.
- Choose a box per item, with or without a window and film.
- Pick an insert: cut card, folded divider, crinkle fill or none.
- Send artwork, quantities per item and the weight statement text for each.
- Approve the free proof; the boxes are printed over 4 to 6 business days and tracked UK delivery costs nothing.
What mistakes do bath makers make with boxes?
Most of these show up as a chipped bomb or a soft box a month after delivery.
All are avoidable at the quote stage.
If you sell soap and loofah bars alongside bombs and salts, the bath and body packaging range covers the whole table in one order.
- Sizing the box from the mould, not from a pressed and trimmed bomb
- Letting two bombs share a cell
- Leaving the window open on stock that sits in a shop for months
- Boxing salts without a sealed inner bag
- Posting a printed box with no outer carton or mailer around it
- Leaving no space on the panel for the weight statement
What should be on a bath bomb or bath salt box?
Front panel: brand, product name and scent.
The back or a side carries the weight in grams, the ingredients and any directions. Leave a clear area of about 25 x 8 mm for a batch code stamp, because bath batches change often.
Bath products are cosmetics in the UK and labelling rules apply to them; what those rules require is for your assessor or adviser to confirm. The box simply needs the room, and a 65 mm cube has four panels of 65 x 65 mm to work with.
Keep the type dark on light. Kraft board darkens any colour printed on it, so body text in black or a deep brown reads best there.
