None on the back
(other than a space to put a name tag).
On the long side opposite a carry handle there's a zip
compartment into which you can place a water bottle.
This can be zipped closed if you don't have a water
bottle inside, and depending on the bottle size and how
fully packed the bag is, may possibly be able to closed
with a bottle inside as well.
There are multiple layers of compartments on the front
of the bag, as you can see in the picture, above (again
hinting that this bag may have evolved from a backpack
to start with).
outermost compartment at the top is perhaps intended for
placing an MP3 type player in it. It has padding
on the front to protect against impacts, and, as a
clever idea, has an overlapping couple of pieces of
fabric at the top through which you can thread a headset
cord (what High Sierra refers to grandly as 'an
integrated headphone port').
This is an interesting idea, but impractical in the real
world - who wants to have their MP3 player (which is
usually very small and easily carried) zipped up inside
their carry-on bag, and even if you wanted to do this,
most headsets don't have a long enough a cord to enable
you to sit comfortably next to the bag, rather than
crouching over it with the headset cord stretched tight.
I'm not quite sure what else you could use the
compartment for - it is quite roomy inside, but has only
a small 6.5" zip opening and is tight. If you kept
loose coins in there, they'd be hard to retrieve, and it
is too small to easily put itinerary information and
tickets in and take them out again.
Behind this little pocket is a much larger pouch type
compartment, with two zips that run in an oval track
down one side, along the bottom, and up the other side.
A waterproof pouch/compartment inside is about 12" wide,
goes down the bag about 8", and - depending on what else
is packed in the bag, could go into the bag as much as
5" or so.
main opening on the front of the bag is below the other
two pouches. It is much larger, with two zips
running around three sides (the top and two sides) almost
but not quite to the bottom of the flap, which has
fabric gussets at the bottom to limit how far it falls
open when unzipped.
This compartment measures about 12" wide by 13" tall,
and is perhaps 2" deep. The front (exterior) flap
is padded to protect the contents inside. Inside
are a series of pockets and loops and flaps, designed to
give you places to put pens, business cards, office
equipment, maybe some files, and other such things.
In particular there's a clip which is useful for
mounting keys on, and a zippered mesh pouch that can be
good for putting small little things in that might
otherwise get lost if left loose in the bag.
Behind all the pouches on the front is a double zipper
that goes around the top of the outside of the bag and
down 13" of the 21" of the exterior bag's dimension.
Opening this up reveals two compartments - an outer one
that is the full size of the bag, but without much depth
capability, and an inner one with extra padding that is
designed to carry a laptop.
My 14" screen Dell laptop fitted very easily into the
generous space available, indeed, it was loose on both
sides and at the top, even though a strap comes down to
hold the laptop in place, and if I were easily worried
about such things, I would worry that the laptop could
bounce around inside the carry compartment.
High Sierra needs to better reflect on the issue that
one size doesn't fit all laptops and come up with a
better way of making the laptop fit snugly in its carry