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The ones you can see on the video are ancient plastic-topped bottles I picked up from a second-hand supplier many years ago and which I always carry about in my back-pack in a small metal tube that once contained vanilla pods. Insects breathe very slowly so there is always plenty of air for them even in very small containers. But they do suffer in confined spaces so if you want to examine them in a glass tube pop in a piece of tissue paper so they do not get covered in condensation and also pop in some leaf so they do not get too dehydrated. This also gives them something to cling onto while you peer through the lens. The ladybirds would have been quite OK for several hours, but a bumblebee would not have been very happy at all.
As I said in my video blog, I feel very privileged to have stag beetles in my garden. They are monstrous wonders, especially when flying. They are now much rarer than even, say, 30 years ago, and the only place in the country they regularly turn up is south-east London. Look at map 7 on page 8 of the report on stag beetles prepared by the People's Trust for Endangered Species and you will see the single red spot showing the greatest numbers of stag beetles seen 1998-2002. That's where I live and I love it.