The bleach bottless I usually get are 1.42 gallon, so they might need tuning; but bleach bottles do seem to be generally made of a somewhat "harder" plastic than others of about the same sizes, although the sidewalls aren't thick enough to contribute much "acoustic inertia." When empty, they'd be very light weight compared to most other good choices.

Regular "grocers" seem to carry mostly the 1 gallon size, but commercial (warehouse) stores should have the larger ones - very cheaply.

I also get (liquid) laundry detergent in the "120 loads" size, and while the plastic isn't as "hard" as in the bleach bottles it's a bit thicker, so I'd expect similar performance - although the detergent jugs tend to odd shapes so you might have to be "creative" about which hole to blow, and make sure that any other holes are fairly tightly sealed. They do (the ones I get) have a nice large handle that might be worth a look, if you intend to do anything "unusual" - requiring manual dexterity(?) - in the act.

John