[smokin’ joe]

unsure what CHCH has for recycling bins, but the 60L-ish rectangular bins in Kaikoura are ideal .
Alternatively, industrial chemicals often come in either 100 or 200L plastic drums and are easy to cut down with a hand saw or jigsaw. they can be found almost anywhere like freezing works/tanneries etc , anywhere that highly acidic/alkaline fluids are used.
keep your eyes peeled next time you are at Lyttleton (a small fee may be required).