What filesystem for large thumbdrive

[david-8uUts6sDVDvs2Lz0fTdYFQ at public.gmane.org (David Kramer)]

I would like to use a thumbdrive for offsite backup so I picked up at
16G thumbdrive (the backup file for my server is about 12G).  In other
words, my use case is a very few but very large files.

I formatted it with ext3 with 2K block size (so I can put larger files
on it), and am finding it VERY slow.  I'm trying to copy the backup file
to it, and 45 minutes later only 1.5G of the file was copied so far.

This wasn't supposed to be a very slow thumbdrive (Kingston DataTraveler
I - 16 GB USB 2.0 Flash Drive DTI/16GB), so I'm wondering if I should
have picked a different filesystem.  I guess I don't really care about
journaling since I'm putting on copies of files, and doing it maybe
every few weeks.  Maybe I should try ext2?

This is Ubuntu upgraded to 10.4 mere hours ago, BTW.