I started collecting last year, and as a noob I made noob mistakes.
I stared off carrying a test tube setup in my pocket - yes water and all - that is until one day I squatted down and my knife shattered the tube in my pocket. So I swapped to an empty polypropylene tube, however on active days dumping stuff in and out of my pockets lead to cracking and breaking. On top of all of that trying to catch in a test tube is, well near impossible.
I upgraded to a "super tube"/ "baby soda bottle" / "bottle preform". Wider mouth, stronger plastic, bigger, took up more room, lead to a few odd questions with my friends about what exactly was in my pocket. But I have to say though, I loved them. Easy to clean. Easy to transfer (just slide your test tube setup in and gently scoop up a queen). Big enough I could catch multiple queens (of the same species) in one tube, and transfer them once I got home.
Then Mid-august last year my wife came home from Target and gave me these travel jars - $.75 each, slightly larger mouth then the preform, smaller profile, same benefits. So I thought I'd share.