This is no good for dragonflies or other large arthropods, but I highly recommend it for small insects and spiders: https://www.amazon.com/gp/product/B000JQ5AZK It is an insect catcher with a sliding lever which you can place over a quick-moving insect on the ground or a flying insect perched on foliage or a wall. A fantastic investment! I’m even planning to buy a spare or two, in case I ever lose or break my original one. I find it particularly useful for catching and chilling small flying insects for photographs, like sweat bees, hover flies, and small wasps, which won’t normally hold still for long.
A couple of caveats:
The sliding panel has a tendency to warp a bit, so it doesn’t fit quite as well as when it was new.
The magnifying glass hasn’t been super useful for me–insects don’t usually stop in the center below it.
It’s not great for really tiny insects–they can still get out sometimes.
I don’t recommend it for hoppers unless you immediately transfer them to something softer, like a ziploc bag–they may injure themselves by bashing against the plastic. Probably true for some other taxa, too.
Here is a beewolf (wasp) I photographed this week after catching it with the bug catcher, chilling it in my fridge to make it temporarily more docile, and photographing it on a nice neutral background (a brown bowl I like to use): https://www.inaturalist.org/observations/56155752 I would have been very unlikely to get such a good photo set without the help of my bug catcher!