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ShieldBreaker, so this is difficult to explain, but imagine you have access to the largest crate in the game (it has the most empty slots) and you are in the middle of a lab run. Hypothetically, (since I can't recall) this crate has 30 slots. You unload 30 items into that crate to free up space in your inventory for the rest of the lab run. But, when you get back to town, the person who dropped that huge crate doesn't have another huge one to drop. They only have a small one with 8 slots. When you open that crate, you're staring into the same "storage dimension" as you were before, but with far less "deposit slots". Luckily, when you begin removing items from this smaller crate, as each item is deposited into your inventory, the empty spot it left behind is filled up by the next item in the "storage dimension". This allows you to remove all 30 items from the 8 slot crate, but if you were to deposit new items there, you'd only have access to the smaller crate's 8 slots.
Make sense?