Koichi has so much money that he can swim in it.
If I remember correctly, I think they sell broccoli in bunches.
I have to get some copy paper. Could you exchange a bundle of copy paper for this bouquet of flowers?
The kanji and the word are exactly the same. That means they share meanings as well.
Since this word is made up of a single kanji, it should use the kun'yomi reading. When learning the kanji, you didn't learn that reading, so here's a mnemonic to help you with this word: You are counting your bundles. There are a lot of them, so you have to create tabs (たば) in your notebook to properly categorize everything. Imagine yourself doing this (physically creating the tabs in your notebook, even though your notebook didn't come with tabs).