A good word for a list with too many items

I'm struggling with a word for a list which is very well built, sorted, and organized, but it's a heck of a headache to deal with because there are so many items.

The list doesn't display old items, to prevent it from becoming______________.

I've toyed with the following words, but they don't seem to fit:

• crowded (can a list be crowded?)
• cluttered (has implication of messy, but the list is very well organized)
• overwhelming (this is more of a person's reaction than a list characteristic)
• jam packed (not proper enough)
• congested (not blocking anything)

A simple way to express this would be to say the list is becoming too long.

From Oxford Dictionaries Online:

3 Relatively great in extent:

‘write a long report’

‘a long list of candidates’

You apparently don't want the list to seem endless or interminable.

The list doesn't display old items, to prevent it from becoming endless/interminable.

ODO:

endless ADJECTIVE

1 Having or seeming to have no end or limit:
‘the list is endless’

interminable ADJECTIVE

Endless or apparently endless (often used hyperbolically)

‘After a while these interminable lists acquire a certain ghoulish fascination, prompting a host of other questions.’

Collins:

endless adjective
1. having or seeming to have no end; eternal or infinite
2. continuing too long or continually recurring

interminable adjective
endless or seemingly endless because of monotony or tiresome length

Collins English Dictionary. Copyright © Harper Collins Publishers