You could use a mesh tent outside I spose.
Personally, I'm not a fan of taking mine outside but not for the reason you probably think
I have done far far farrrr to much research on parasites, the potential for my gliders getting parasites from out side is probably slim but still enough for me to not take them outside.
I HAVE taken joeys outside for a few minutes to take pics on tree branches when they were young and not very mobile or quick. But I would never put them on the ground or in the grass.
Parasites can be hard to detect even with fecals, hard to treat, and for me it's just not worth the risk.
Gliders can get parasites in other ways without going outside as well, but if I can eliminate even one source I def would.
I also wouldn't take them out during the day, I live in fla it'a to bright and its to hot. Gliders can and do over heat, and mine don't care for lights being on or sunlight they'd likely stay in the pouch or in my clothes, and be even hotter.
So if I were to do outside time, it'd be at night, in a inspected, secure mesh tent, not in the grass lol
I'm sure folks that have screened in florida rooms outside take their gliders out, but for me it's to much of a hassle and I'd constantly be worried, much easier to just open a window behind their cage lol.
I am not saying you can't take them outside, if its something you want to experience with them just use common sense. Pay attention to the temps if it's above 80 I'd keep em inside, have water with you for them and if the gliders get wet they are likely sweating and need to be taken inside...