A guy on a scruffy bike
Impossible? Nah. If the filter is a recurring item, you might be able to make a sturdy box for it, with shoulderstraps so you could wear it like a backpack. Big heavy bags of feed or cat litter or whatnot I usually just drape over the gastank, and support in place with my knees.Every time someone points out the saddle bags on my VTX I say "I friggen HATE them, ugly as sin... but they are just too damn useful to remove". Yes, between backpack and bags I can carry quite a bit after a parking lost game of tetris. There are those few pesky impossible items though. Like the fragile 24"x24" air filter for my AC unit, and the 40lb bags of feed for my critters
I finally, after using this bike daily for 19 years, got my hands on a pair of hardbags for it. I haven't fitted them up yet, but I'm looking forward to the added utility.