With mods like Bandoliers - Bags and Pouches I find it kinda odd that we dont have actual coin purses. As some one that is getting more into realism mods I find that I would love to have actual coin purses that you have to equip to carry money without fear of loosing it. There could be different sizes ranging from small (150) to large satchel (10,000) that allow you to carry your septims without fear of losing them. Trying to carry coins without one could make you have a % chance of loosing up to X coins.

They should be craftable, and perks like Cutpurse could allow you to snatch some ones coins instantly.

Also would be fitting with mods that give coins weight and the purses could cut that weight in half as a bonus feature.