you're doing eng so its not like you'd ever need to take anything to uni with u? so seriously just ride a pushy (i had an a3 folio and supplies, so even if i left my laptop behind it was to much). a fairly flat 13km is basically the ideal distance for a daily commute - as long as its not raining!
besides the cold, rain, and lack of daylight, riding's my prefered method of getting to work, only its 30km each way which is a bit to much, and currently takes an extra half an hour due to my lack of fitness - hopefully that will change soon