After saying goodbye to Bran, Sera headed home and quickly packed a small bag. There wasn't much she needed, they would gather food and water as they move through the land.
The only real concern was clothing, but that was solved by her armor most of the time. Only issue was that it drained her essence constantly. Luckily she could literally wear the armor for a full year without it fully draining her life essence.
She only packed two separate outfits, while also wearing another one. This gave her enough to switch around every now and then. It wasn't the most hygienic, especially the underwear department, but technically she was a soldier. Also the torture sessions really helped elevating her ability to not feel discomfort.
Other than clothes a normal evolved would pack something to make fires with, but Sera had her own flames, which made taking any such item redundant.
