Best value in 12V fridges, Indel B vs Dometic

I have an indel b 51 main compartment 11.75" x 12.5" by 17.75 deep has 2 indentions at bottom for 2L BOTTLES. After a couple years still doing great
 
Thanks captwoody. Extrapolating from that by assuming the same thickness top and bottom, the 31A should be able to fit 11 3/4" and the 41A should hold 14 3/8" bottles upright.
 

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