Preload your syringes bro, that's what i did. Put them in a toiletry bag with your hair comb, razor, tooth brush, etc. That's only if you're planning to shoot 2-3 a week. 5 syringes at most is what i would do. You can reuse the same syringe twice, just make sure that you change the needle tip. Put couple swabs in there too, shove them in your check in bag (not the hand bag of course), and you are g2g no questions asked. They won't throw you off the flight, or put your ass in jail for couple syringes with 10-15mL of steroids in them lmao. They are looking for bombs or kilos of drugs, should be the last of your worries.