The weatherproof Lab Pack w/Metal Band uses a metal lever locking ring.
It's made of high-density polyethylene, is nestable and incinerates completely.

U.N.-certified to HM-181 1H2/X100/S
Meets 49 CFR 173.12(b)
Meets FDA 21 CFR 177.1520
Capacity: 30 gallons
Weight: 15 lbs.
Dimensions: 21.125" x 28.5"
U.N. Markings: 1H2/X100/S