I keep a makeup bag with everything I need in it in my backpack. Dollar tree has little doggy poop bags that are black so you can toss the syringes, a whole roll has like 50 bags and it fits in the bag as well. I put just the needles in a used pill bottle that stays in the bag. The "welly bravery badges" come in a little tin case that fits the testosterone bottle, plenty of alcohol swabs and bandaids. I can fit 8 syringes in the bag so that is an entire month if you do weekly shots, 2 months if you do every two weeks.

It doesn't work as fast as injections, but topical hormone cream is the easiest version of it to hide. Especially in a makeup bag !! And you can cover and/or relable it in order to disguise it.