These are the most popular modifications:

Extra belts on a front

Double leather belts
Price: 49 PLN 

Suitcase handle

Adding a leather handle in order to fix it to suitcase’s handle

Price: 29 PLN 

Long zipper back pocket

Price: 39 PLN 

Individual engraving

 
Your brand, logo, initials.
Price: 25 PLN 

Closing zipper

Adding a zipper closing the whole bag.
Price: 29 PLN 

Extra chamber

Adding extra chamber

Price: 49 PLN 

Thread

Changing the colour of the thread

Price: 15 PLN 

Longer shoulderbelt

 
Long about 170 cm

Price: 15 PLN 

Handle
 
Adding a handle

Price: 25 PLN