Large zipped main pocket folds over with main zipped pocket and two smaller front pockets. 

From manufactuer
The Ohyo bag is:

• a tablet bag that increases in size to hold your gym kit.

• a workbag that expands to hold your groceries.

• a backpack that unfolds for a weekend away.

• a travel bag that gets bigger to accommodate those last minute purchases.

It truly is a case (or bag) of one size fits all.