I've been using the same Samsonite since 2012, though granted it hasn't seen full time duty for all of those years. In a way it's really just gotten ~6 years of real use by my calculations - driving to work and occasional air travel don't count. Walking a half mile to the train to go to work does. It's got a bit under 4 years of doing that every day on it, plus 3 years of 2 days a week, so about 6 total.
Really you just need something that doesn't suck. Pretty sure that Samsonite was a bit under $100 back in 2012. It's like anything else apparel, accessories or luggage. The cheapest is shit and the expensive ones are waste of $ designer bling-bling.