Full bundle has 18 pieces of merch, with 1 item exclusive to the full bundle!
There are two Half bundles with 8-9 pieces of merch each. The half bundles are basically the full bundle split into 2 smaller sets.
These numbers exclude stretch goals, which if fully unlocked, are an additional 6 items for the full bundle, and an additional 2 items for the half bundles.

There is no digital merch, all items are physical.