frieren briefcase

Either Flamme showed her how or she found it in one of the many magic books she found over the years given that she’s like over 1000 years.

There’s also her mana as shown vs aura which I think is an indication of how strong she is but probably not a strong as Serie

I would love it if the explanation was that she has a Grimoire that can hold an infinite number of items and objects that she wants to carry.

@ReMightyRon agreed i hope the manga explains it in the future more on how it works and its origin

I was also wondering about that suitcase, so far I assumed it's just a normal suitcase and they just don't take a lot of stuff with them and travel lightly.
But it seems to be magical in some way according to the last episode, I hope we'll get the backstory why that is eventually.

@deg The funniest part of yesterday's episode is precisely that scene where Frieren is sleeping under a pile of various magical items, lol.

@ReMightyRon for sure and those pile of magical items will definitely be carried by that magical briefcase

I'd assume she has a spell to levitate the stuff inside.