I have a 100 qt Igloo that I use for an ice reservoir.
It will hold (11) 7lb bags of ice.
I made a "follower" out of 5/8" closed cell sleeping pad foam that chases the ice down as it is used.
In this weather it holds ice over 7 days.

The wife bought a Canyon (roto-molded) mid-size...not a fan.
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NO STEP ON SNEK