the usage and origin of the expression "I bags that"

phrase-origin

This expression is used when you want to reserve or secure the right to do or to have something: he bagged the best chair.

I see this listed as Australian slang but also have noticed references its to use in other countries.

I can see the potential links to capturing something ... but that sense doesn't really completely capture the sense of 'laying claim to something'.

Is the expression as used in this sense largely confined to Australia?

And is it possible to say whether it definitely derives from the 'bagging a tiger' etc sense? And if so, how/when the extension occurred?

Adding to the previous answer:,

In AmE, you'd probably shout dibs. In BrE, at least down here in the South, bagsy would do, though it might just be bags. To put this in the verbal form, you can bags or bagsy something, but, as you can see from the OED examples, the spelling is hard to pin down:

1946 B. MARSHALL George Brown's Schooldays xxi. 89 ‘What about you doing the gassing instead of me?’ ‘But I bagsed-I I didn't’, Abinger protested.

1950 B. SUTTON-SMITH Our Street i. 25 [They] would all sit..‘bagzing’. I bagz we go to the zoo.]

1979 I. OPIE Jrnl. 28 Mar. in People in Playground (1993) 129 I'm second, I just baggsied it! 1995 New Musical Express 28 Oct. 28 (caption) Mark Sutherland baggsys a window seat.

1998 C. AHERNE et al. Royle Family Scripts: Ser. 1 (1999) Episode 2. 52 Mam. I think I'll do chicken. Antony. Bagsey me breast.