We heard a few people on the internets mention about how they were disappointed they couldn't carry objects between rooms in their hands - that the only way to get objects from one room to the next is with the backpack. It made a lot of sense! Fortunately it wasn't much work to implement so we decided to get that in a quick little patch.
So with today's update it's now possible to carry objects from room to room with your hands or with the backpack, totally your choice now though! :)
Cheers! ^.^