The fabulous bucket bag of course. Polishes can go all around the outside in secure little pockets and be clearly visible to clients. I never use anything else ... I have several for different things. They hold tonnes They are super light weight, have an over the shoulder adjustable strap and they are easy to pack in and out of the car.
I have one for pedi things, one for enhancments one for manicure and one for gels. Very easy to keep everything separate and super organised. Not expensive.
I have tried every box known to man ... HATE boxes ... lids and trays and not easy to see everything at a glance or to repack like the bucket bags are. If you've never tried one do ... you'll love them.
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