The litres printed on a label are not the same as space available for goods. When comparing bags, measure usable capacity after products, plates and dividers are loaded.
Measure with the same method
Record each model's internal dimensions, openings and the largest item carried. Place plates as specified in that model's technical sheet and measure how much product fits. Do not report external volume or catalogue litres as usable capacity.
Dividing price by litres alone can make different services look equivalent. First align route, load, coolant and acceptance conditions. Holding profiles are comparable only when tests use the same starting conditions, loading, environment and measurement method.
Calculate cost per use
Use quotes or invoices for purchase, cleaning, maintenance, spare parts and replacement costs. Divide the total by expected uses; base damage or service life on records and supplier terms rather than guesses. Show usable capacity, test conditions and cost per use separately in the final comparison.