Talk to his parents first about what they might have already bottom-drawered for him, so you don't duplicate
If you want something a bit landmark/permanent, then leatherman tool or Swiss Army knife
Don't wrap items in your hamper, put them in useful Tupperware type boxes
Yes, unfortunately vodka might be the most welcome item (how times have moved on, it was a bottle of wine or 6 tinnies in my day!)
Stationery - boring but necessary - post it notes, scissors, sharpies (esp in shared accommodation!), paper clips (all the things that make you think 'how much! when you buy them rather than inadvertently take some home from the office
Alarm clock (for when out of charge, or back up needed)
Small 'housewife' sewing kit
Cookbook
Marmite, nutella, chilli flakes, hot sauce, ketchup, favourite crisps or other preferred long-life nibbles,