In my bag, there's a wallet, a bento, and a pack of cigarettes.
I left some sides in my box lunch and gave them to a kitten.
I think I’ll make a bento box for you tomorrow. Is there anything you’d prefer not to have?
You know how 弁 means dialect and 当 means success? Well, this isn't going to help you much, because this means bento or box lunch. Chances are, though, you know the word "bento" from English. So, if you read this word (which you should be able to) you can figure out it's べんとう. If you do that, you can realize this word means bento too!
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.