I've been using these totes for storing camping gear and they stack beautifully without wobbling. The snap-on lids hold tight even when I'm moving them around.
The lids actually snap down tight, which I wasn't expecting at this price for a 4-pack. I've got two stacked in the garage holding holiday decorations and they haven't shifted. The grooved top keeps the upper one from sliding around.
I loaded these up with camping gear and the snap-on lids hold tight even when they're crammed in the truck bed. Stacking four high in the garage saved me a ton of floor space.