E-commerce ruled the holidays. So why aren't Bay Area recycling centers choking on cardboard? FacebookTwitterEmail 1of5 Reggie Cummings inspects bales of cardboard stacked at the Recology recycling facility on Pier 96 in San Francisco.Paul Chinn / The ChronicleShow MoreShow Less 2of5 Residential cardboard collection has increased, but the rise is offset by a drop in pick-ups from businesses.Paul Chinn / The ChronicleShow MoreShow Less 3of5 Anthony Babbs readies a bale of flattened cardboard for shipping at the Recology facility on Pier 96. Some cardboard is shipped overseas for processing.Paul Chinn / The ChronicleShow MoreShow Less 4of5 Recycling businesses like Recology urge consumers to flatten their cardboard.Paul Chinn / The ChronicleShow MoreShow Less