I got my first BP after I graduated from college, and decided that I totally could've gotten one while in college... They're the easiest animal I've ever kept, if you don't go all fancy right off the bat. Especially if you're getting a hatchling first, even more convenient for at least half a year.
You can keep everything very easy to move during summer break if you go with a tub setup. An adult male can live in a 32 qt latch sterilite tub with ample room. Hatchlings can live in 15 qt tub. Substrate, thermostat, heat pad, a couple hides from reptilebasics and a water bowl, + hygrometer/thermometer, that's it. Maybe add a branch or two and some fake leaves if you want. When you move, just put the snake in a pillow case, put the pillow case in the tub, bring it all home.
That 5x7x12 size might be too small to store the bulk feeders you buy online. So you can buy a few F/T from petsmart at a time (but it's much pricier than buying in bulk), or find a local feeder breeder and humanely euthanize them yourself.
ETA: Just wanted to add, I lived in an apartment right after college last year with my two ball pythons and a dumeril's boa. Every few weeks when we have a long weekend at work (3~4 days off), I'd drive them all to my family's home with me and set them up right away. They were all in tub setups. It's really very easy to transport.
Leaving them for 2~3 days is totally fine. The only worry is if they poop the first day you're gone. Then you'll find a mess when you get back. =P