Reading this overview by the Airsoft & Milsim News Blog (AMNB), it looks like the Helikon-ex Service Case as a good EDC bag... "Cleaning, maintenance or fixing gun issues in the field, at home or on the range has become a new best friend if you ask me. If you had issues, finding the right tool for it in the past, which is able to carry your entire essential to work on your guns, – look no future the Helikon-Tex Service Case has you covered from now on!"

Read the overview here.