The inventory system and item size is a major deterrent to actually exploring

Vahnkiljoy

I play only in survival and the biggest complaint I think I have is that, there isn't anything that really PROMOTES exploring things like caves or the like, because if you plan on grabbing anything then you can't bring any tanks for air, needs food and water to stay alive, a flashlight to light the dark in caves, a seaglide to move around easily(at least until it breaks, but at least you still get the speed from it). The problem is that EVERYTHING you hold is a 2x2 inventory sponge(glide being 3x3), tanks being the most important thing eat up massive room, nothing stacks which makes things worse, I WANT to go spelunking but that would require a flashlight because the seaglide doesn't really do much in the way of light even though it has one. That or flares but there again lies the problem, nothing that seems like it SHOULD stack does, making your already small inventory even smaller.

Tanks should be 1x2, not 2x2.
The knife should be either 1 box or a 1x2
Let things like water/same fish stack.
Let pipes stack.

aeroripper

Agreed, stacking would solve a lot of these problems, and make the inventory a lot more organized.