Wow, she's on another octo-planet with all the excitement! The bump only gets a small sound from him; otherwise, Tidus about ready to chuckle in the absolute giddiness she's exhibiting.

"That's cool-looking!" Like, it's not untrue! But he looks from it to Eight, eyes wide with interest. "But what does it do? Is it just your bag?"

'Just' her bag. But hey! Getting personal stuff back matters, okay!