I noticed there is a $5 mesh backpack at a FiveBelow store.
(But I don't see it at FiveBelow.com)
It is a good idea to maximize the ventilation of the skates to get rid of the moisture rfom the ice and sweat. This may be a good way. Just bought one. Hopefully it will fit the skates.
I may carry a lightweight plastic bag inside in case it rains.