When shopping for a new backpack that can accommodate three textbooks, a laptop, chargers, notebooks, and calculators, several brands and models are recommended for their durability and functionality. LLBean backpacks are noted for their ruggedness and lifetime warranty, while Swiss Army backpacks are praised for their built-in laptop pockets and spacious design. The 33L Mammut trekking pack is also highlighted for its capacity. Users have shared positive experiences with Targus and Jansport backpacks, emphasizing their longevity and ability to hold multiple items. Recommendations include looking for features like water resistance, good fit, and a suede bottom for added durability. Additionally, using a laptop sleeve is advised to protect devices from scratches. Overall, options from camping supply stores or brands like Mountain Equipment Coop and Magellan's are suggested for reliable choices.