Does this case have a latch or locking mechanism?

Locking details are not specified — you may need to test-fit with your own latches, velcro straps, or fasteners depending on how you plan to secure it.

Can I stack other cases on top of this one without crushing it?

Polypropylene is rigid and impact-resistant, but stacking heavy loads directly on the lid over time may cause deflection. Use shelving or spacing to distribute weight evenly if stacking multiple cases.

Is this case weatherproof?

The polypropylene shell is water-resistant and handles moisture well, but it's not fully sealed — gaskets and drain holes are not confirmed, so don't rely on it for submerged storage. Works fine for shop, garage, and vehicle transport.