Just FYI, if you do mean what the sibling replies say, a "life belt" is a flotation device in the shape of a belt. Refers to a "life jacket".

"buy it for life", belt. Not buy it for, "life belt."

The list makes it really hard to read that way with parens. It parses like this to me:

  Definitely buy it for (life belts, wallets, etc).

Hah! That never occurred to me until you pointed it out.

The person's referring to the general term "buy it for life" - products that last a lifetime or longer. (https://www.reddit.com/r/BuyItForLife/)