I cut out the elastic internal retaining strap in my Santiago 20 and I can fit a battery in the internal pocket opposite the right of the S95 camera. The supplied Canon camera strap also fits into the case if you make sure that the rigid plastic piece is not between the spare battery and the camera. There is additionally just about room for an SD card but not if in a standard SD card case.
I snipped off the zipper pulls because they are rigid and noisy as they tap on the case. I replaced each pull with half a black shoe lace tied into a cobra knot.
The weight of the modified case is 288g fully loaded with the S95 camera, internal battery, internal SD card, strap and a spare battery.
The supplied carrying strap is long (around 58 inches) and has a single plastic clip that attaches to a single loop on the case.
Overall a good semi rigid case although it feels heavy in a trouser pocket and is fiddly to use if you want the camera strap in the case.