Your bag will be checked
People bring small backpacks in all the time
From the SAP Center website: "SAP Center at San Jose conducts security checks with walk-through metal detectors at every event. All large bags, large backpacks and suitcases will not be permitted in the building. Permissible bags must be able to fit underneath your seat without blocking the aisle way. Baby bags are permitted, but baby strollers and baby carriers are not permitted." Clear bags are not necessary, but if you have a bag it will be inspected and you'll need to go through a designated line for people with bags.
Yes, clear bags work best
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