Re: Belt/Strap for Aluminum Poker Case?
Walmart (and The Home Depot) both carry bungee cords in various lengths. Rubber straps with hooks work better, last longer, and have less 'give', imo -- they are also available at both places in various lengths. A single strap should work just fine if you get it tight enough.
If your latches have a lock, using that should prevent it from opening when you want it to stay closed. I've carried chips in AL cases for years (usually 600 or 750 chips, so a lot more weight than just 300) and I've never had a latch fail while a case is being carried. I don't bang 'em around though -- that will cause a case to accidentally open more so than the latch failing.