For your situation, I'd suggest the Drive Auto Products Car Trunk Organizer with Straps. I've used it in my Mazda 6 and it's super reliable. Just make sure to secure the tie-down straps so it doesn't slide!

Seconding the recommendation above! The straps are key because the Mazda 6 carpet is pretty slick. In my experience, I've found that the Starling's Car Trunk Organizer Adjustable 3-Compartment is a solid alternative if you want more rigid walls. It’s got a waterproof bottom and non-slip pads that really grip teh trunk floor. For something more heavy-duty, you could look at the Fortem Car Trunk Organizer with Reinforced Base. It feels a bit sturdier for heavy groceries, though it's slightly bulkier. Hope this helps!

Honestly, I've had issues with expensive organizers that just don't stay put. In my experience, you don't need to spend $50+ to solve this. For your situation, I'd suggest the TrunkShield Heavy Duty Collapsible Cargo Organizer. It's usually under $25 and has surprisingly rigid walls for the price. I found that using cheap bungee cords with it works better than any built-in straps. It fits the Mazda 6 depth perfectly without eating teh whole floor!

> I’ve been browsing some generic options on Amazon, but I’m worried about getting something that is either too bulky and eats up all the floor space, or something so flimsy that it collapses under its own weight.

Hey! Honestly, I totally get the struggle with the Mazda 6 trunk! I’m still pretty new to the whole car enthusiast world, but I’ve been obsessively researching how physics affects our cargo. See, when you take those sharp turns, loose items create kinetic energy—it’s actually a huge safety risk because shifting weight can suddenly change your car’s handling during an emergency maneuver!

Because the Mazda 6 has that deep layout and slick factory carpet, you really need something with high-friction bases. I’m super excited to share what I found! For your situation, I would suggest looking at the Rola 59001 M.O.V.E. Rigid Base Trunk Organizer. It's amazing because it actually has a non-slip bottom that stays put even without using a ton of crazy straps. I mean... well, actually, it’s the rigid interior walls that really won me over because they don't collapse when you're cornering hard with heavy groceries!

Another fantastic and safe option is the Highland 1840100 Black Universal Cargo Net. It's technical but simple! Using a net alongside a solid bin ensures that even if the bin shifts a tiny bit, nothing flies out to become a projectile. Safety first, right? Keeping your cargo weight distributed properly is so important for those zoom-zoom vibes! Hope this helps you tidy up! Let me know if you need more info.