Elbow room. Staggering depth of upper backbar fixtures is advisable for aesthetics, function, and modular design, and therefore 10″-13″ depth is appropriate. Below the counter, the usual suspects, ice bins, wine coolers or mini fridges, and functional storage keep the countertop depth at about 24″. Embrace the counter space for bartender useage, trust that they’ll keep it clean when possible but give them room for drink mixing and slinging. Likewise, give bartenders enough room between the bar and back bar for multiple tenders to work around each other when your establishment is busy.