What items should I save for when I have another baby (which will likely be years away)?

It makes sense to save anything that you will reuse as long as you have the space to store it. Any clothes that are in good condition with no stains, and any equipment (jumperoo, swing, bouncy seat, walker, high chair, stroller, car seat, etc) should be saved. Also save your pump. You can save the bottles if you really want to but they're so inexpensive it's easy to just replace them. Also, it's probably more sanitary to just buy and sterilize new bottles. Definitely do not save the or pacifiers. They deteriorate over time and with much use. It's safer and cleaner to buy new ones. Just pack it all up and store it until baby #2 arrives.