User blog comment:Supermrman911/More Suggestions for Terraria 1.0.7 (or 1.1)/@comment-4544106-20111022082215

You should add in a new NPC who sells maybe Empty Sack(s) and you can combine them with other ingredients from a monster to make a summoning sack. Also you could use it for other things like an ore bag where you can keep your ores or items but you'd have to reinforce it with silk and it wouldn't have the same capacity as a piggy bank, safe or chest.