A pet turtle or parrot.
A good saddle, with proper care and oiling, should make it long enough to be passed on to your kids in perfect order. Well cared for firearms can have an enormously long life as well. My grandmother gave me a trapdoor 45-70 rifle that is stamped for 1873, and it still shoots fairly well (with gently hand loaded ammo of course.)
I'm something of a collector myself, chiefly weapons (firearms, swords, knives) and pipes (nothing better than rich Danish tobacco smoked in a quality briar with a glass of good Kentucky bourbon). Both weapons and pipes are decidedly personal items, so it's doubtful any of them will be out of my hands as long as I'm alive. Weapons can obviously be handed down, as some of my own were, and so can pipes if properly cared for and gently smoked. I'm no expert on luggage, but I do know that leather items can last a long time if properly cared for. Just be sure to store them in an agreeable climate and be vigilant regarding the condition of the leather. Personally, I would consult the company you're purchasing these bags from as to their recommendations and advice.
A good beer stein.
A good clock. I have in my dining room a handmade clock that my great-grandparents brought over from Germany in 1908. It still runs, and will keep accurate time for a day or two until its ancient springs make it lose time. With a trip to a clocksmith for a tune-up, every century or so, I'm certain that it will still be ticking on the day the doomsday clock strikes midnight.
Of all the musical instruments out there, many can last for hundreds of years. But pianos are far more hefty and durable than most. A well-made, hand-crafted grand (or baby grand) piano with regular maintenance can go 70-80 years before restoration is needed. And each restoration, if well done, will last another 70-80 years.
At Cunningham Piano Company, we just completed a restoration of an 1859 Steinway. Besides Steinways, we regularly restore old Mason & Hamlin, Bösendorfer, and Baldwin pianos among others.
My mom has a Chickering that's been handed down from her grandparents. I've heard that is a good brand: is that so? Someday we'd like to get it restored: I think the insides are okay but the wood on the outside has lots of chips and dings from moves. And it's likely been decades since it has been tuned. Is that likely to be an expensive restore?
A Randall knife.
I have a game of Stratego that for some reason has been around since I was a kid (30+ years). The box is more tape than box, but miraculously, it has all its pieces. Warms my heart to see my kids play it.