As you sort through mail and prepare packages for shipment each day in Cat Mail Co. you'll eventually encounter packages with special requirements. Sometimes these impact how a package is handled, and sometimes they require a package to be stored in a designated area until the boat or its recipient arrives.

In addition, it's important to understand how recipients picking up their mail may describe packages, because some won't give you a name. Occasionally, they will use the aforementioned unique details in their description, and sometimes they will only reference the size of their package.

Package Size Descriptions Explained

A stack of boxes piled up near a crate in Cat Mail Co.

When a recipient comes to the pickup window, they may or may not give you a name, but they should at least tell you what kind of package you're looking for. The following are descriptions you may see regarding the size of the package and what they correspond to.

Package Description

Image Reference

It's a letter


The small blue or brown envelopes.

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It's a small box, nothing special


The small boxes that are rectangular.

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It's cube-shaped


The boxes are a perfect cube.

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It's a small package


Double the size of the 'small box' package.

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It's a mid-sized package with a cord/rope around it


Either the filing box or the soft-looking packages that have a rope around them.

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'I hope it will fit on my bike'


Wide rectangular packages.

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'About the same size as me'


Similar in overall size to the one that 'fits on the bike' but this one is tall, instead of wide.

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The package has handles


Has a fruit symbol on it and handles on the side of the box.

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'It's a big box...I'm building a cardboard castle'


These are the biggest boxes you'll come across in the game.

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Package Markings Explained

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A recipient may also tell you that their package has a specific marking. Sometimes they will plainly state there's a sticker on it somewhere, and sometimes they may say the package was damaged in some way. Make sure you check all sides of the package.

If you want to make this easier on yourself later, check incoming packages for stickers and then duplicate the sticker on the front where the name is so you don't have to inspect for it later.

Package Marking

Explanation And Descriptions

A Duck Sticker in Cat Mail Co-1

The recipient will mention a Duck Sticker.

A Clover Sticker in Cat Mail Co-1

The recipient will mention a Clover Sticker.

A Sprig of Lavender sticker in Cat Mail Co-1

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The recipient will mention a Sprig of Lavender Sticker.

A Frog sticker in Cat Mail Co-1

The recipient will mention a Frog Sticker.

A lemon sticker in cat mail co-1

The recipient will mention a Lemon Sticker.

A bite mark marking in Cat Mail Co-1

The recipient will mention crocodiles.

A Scratch marking in Cat Mail Co-1

The recipient will mention someone having long claws or that an eagle may have attacked the package. There are a few different-looking scratch marks, so it may not look exactly like this one, but it will look similar. It's possible that three lines refer specifically to the eagle and four lines refer specifically to the cat, but this hasn't been confirmed.

Package Constraints Explained

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These are the most important aspects of a package, as they indicate where packages should be stored to prevent damage. These are the icons you'll be warned about when scanning a package, or see on some packages that come in by boat. You should always scan incoming packages before putting them away, including those coming in by boat, as they may not always be fully marked.

Recipients may mention some of these conditions when picking up their package to tell you which room to search in, so the most common keywords have been listed below.

Package Constraint Symbol

Explanation And Descriptions

Fragile symbol from Cat Mail Co

Fragile — This package must be placed on top of all other packages and cannot be thrown.


Common Recipient Keywords: 'Be cautious, it's fragile'

Heavy symbol from Cat Mail Co

Heavy — This package will crush anything under it, even non-fragile packages.


Common Recipient Keywords: Not lightweight, heavy, and 'hope you have someone to help you'

Cold symbol from Cat Mail Co

Cold — This package must be stored in the freezer room.


Common Recipient Keywords: Ice Cream, Refrigerated, Fish Delivery, and Cold

Hot symbol from Cat Mail Co

Hot — This package must be stored in the warm room.


Common Recipient Keywords: Warm, Dragons, Hot Room, and 'Didn't let it cool down'

Dark symbol from Cat Mail Co

Dark — This package must be stored in the dark room.


Common Recipient Keywords: Dark, 'Away from the light'

Light symbol from Cat Mail Co

Light — This package must be stored in the light room.


Common Recipient Keywords: Light, Bright

Partner symbol from Cat Mail Co

Partner (Heart) — This package has another package that must be shipped with it. You'll need to use the lamp in the room with the scanner to find its partner package. The lamp can only be used at night, and a wispy light will lead you to the other package.

Once you have both, mark them both with the heart and perhaps a matching decorative stamp, because partner packages can have different storage requirements. These will never be picked up, only shipped.