I love my bag (basically it's a large open sack). While it has pockets on the outside, the inside has one zipper pocket on one side and 2 holders on the other side. So - all my stuff is thrown in the middle. And I carry A LOT of stuff! This little holder is not that little and it holds A LOT w/o adding any weight to my bag. I also like that it has 2 zipper compartments so I can put personal stuff in there w/o everyone seeing it every time I open the bag. I'm not sure HOW LARGE other people's bags are that I read in other reviews that they say it slides around. The length of my bag is 16" and this thing fits comfortably in it. I've attached a BEFORE and AFTER picture. Seriously, for an extra $10 I now enjoy using my $250+ bag!