On my 14 foot raft, I pack 2 big folding chairs, a 4 inch barrel pump, a roll-a-table, a first aid kit in a Pelican case, a collapsible bucket and fishing rod tubes for my spare rods. There is also usually room for other small odds and ends that don't fit well anywhere else.
I don't think I could live without my drop bag. It makes rigging so much faster. Just throw stuff in and secure the lid.