u/Deadbeat85

Find a relatively cheap bulk order of like 20 gift bags in varying sizes and just buy it. Stick them in a cupboard somewhere and placate your wife (or husband or whatever, i don't care) when she says you're crazy. Your kid is about to have the busiest social life of their entire lives for the next 3 years, and you'll need them.

Buying in bulk will save you a handful of pocket change, but the smug "I've got this" look you give your partner in crime every time another fucking birthday rolls around will be priceless.