After buying the G5, I don't have much money left
for lens adapter and 420 flash etc. So I will probably get
something now that will be big enough to hold these items when I
can afford them later.
That's a good idea so you don't end up needing a new bag later --
like me.

Depending on what you think you'll do, I suggest
getting a bag that'll fit the G5 w/ adapter attached, the 420ex
flash and either a tele or wide converter w/ adapter attached
besides whatever little items.
For something like that, I can recommend the Tamrac Velocity 5.
I've checked out the various Lowepro's, and they just don't fit
quite that much w/ the same ease-of-access, especially if you want
to store a large-ish wide converter like the Canon 0.7x or the Oly
ones. With the Tamrac, I find that I can even keep the 420ex
attached at all times, which I do.

And it offers a waistbelt
that could be useful on occasion though the bag is a bit too tall
to keep in front unless you're a tall/big guy.
I only use the bag w/ 1 divider for the main compartment, instead
of 2 dividers, so 1 side stores my Canon 0.7x lens + adapter while
the other has my G3 pointing downward w/ a few small items below,
eg. omnibounce. When I use the wide lens extensively, I just flip
things around for similar results though I do need a hood hat
(Optech) to keep the flimsy lens cap on the wide lens as much as
possible. The bag also has a notch on each side for attaching
small pouches/cases for additional stuff -- I attach a Lowepro
DRes-25 to hold my Canon tele + adapter.
Hmmm... Maybe you should just get the Lowepro DRes-25 first since
it's not that expensive, and then see where you'll go w/
accessories before going bigger. I personally would not be happy
w/ the Lowepro Nova series or DRes series for what I have. The
Linx series might work size-wise, but I really didn't like the
loud, cheezy "life-style" design.
Man
--
Just a newbie-ish amateur -- see profile for more.
As usual, YMMV + caveat emptor.
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