Can't vouch for Alu-Box but know that three sizes of the
Zarges K470 are "bear resistant." From what I understand, and for what it's worth, Zarges cases are the original aluminum travel cases.
One thing I like about them is that the rubber seal/gasket is in the lid, not along the edge of the bottom part of the case. The way I do things, that seal will stay less scuffed or damaged in the lid than it would if around the bottom part of the case.
I have three of the cases in two of the K470 bear-resistant sizes for my outdoor camp kitchen and have used them all over the US. They've been approved to stay out before by park rangers in bear country. I'm in Maine right now, then headed up to the Maritime Provinces, and hopefully this summer across Canada to BC, the Yukon, and Alaska, and know I have the right cases for the trip.
Here's the Zarges page on the
K470 sizes.
They are pricey, but rugged, dependable, and will outlive me by generations. I don't regret for one second getting mine.
Here are two vids with bears and Zarges aluminum cases:
Here's two of mine in my typical base camp kitchen setup:
All of this doesn't mean I'd leave them out, though, in bear country while away from camp. As noted above a few times, making one's camp as unappealing as possible is wise. Keep your food and food containers put away, and all pots, pans, utensils etc cleaned up from food smells as much as possible. Don't wipe your hands on your clothes, either, when out hiking and camping. We all have stories about someone being woken in the middle of the night by a bear poking its head into a tent, rooting around for the source of that great bacon smell someone wiped on their pants leg.
Hope that helps in your decision!