# Cart item filters

> Cart item filters allow you to use the items in your customers' carts in different ways to create more selective rules. Use cart item filters, for example, to count cart items, select specific items, or sort them by size, quantity, price, or any other characteristics relevant to your business.

> For the complete documentation index, see [llms.txt](https://docs.talon.one/llms.txt).

You need cart item filters to create [promotion rules](/docs/product/rules/create-and-manage-rules.md#create-a-promotion-rule) in [item campaigns](/docs/product/campaigns/overview#item-campaigns) and to create [strikethrough rules](/docs/product/rules/create-and-manage-rules.md#create-a-strikethrough-rule).

[Create a cart item filter](/docs/product/rules/cart-item-filters/manage-cart-item-filters.md#create-a-cart-item-filter)
generates one of the following results:

- A new list.
- A boolean value.
- A number calculated from the expression of your choice.
- A reference to a cart item.

You can use this result in your [conditions](/docs/product/rules/conditions/overview.md)
or [effects](/docs/product/rules/effects/overview.md) to create more complex rules.
See the [available cart item filters](/docs/product/rules/cart-item-filters/available-cart-item-filters.md).

:::tip
To filter cart items by a specific attribute value in multiple campaigns, consider
using an [Application cart item filter][app-cif] instead.
:::

## Related pages

- [Attribute selector][attribute-selector]
- [Manage a value map](/docs/product/rules/manage-value-map.md)
- [Manage Application cart item filters][app-cif]
- [Create a discount using cart item filters](/docs/product/tutorials/coupons/cart-item-filters-discount.md)

[app-cif]: /docs/product/applications/manage-application-cart-item-filters.md
[attribute-selector]: /docs/product/rules/overview.md#attribute-selector