Advice for freezing veg stock without plastic zip bags

I make a 10-12ish cup batch of vegetable stock from cooking scraps about once every couple of weeks (more often in winter). I’ve been freezing the stock in freezer-safe ziplock bags which has lots of advantages (stores flat, thaws pretty quickly in-bag when floated in hot water). But I hate how many bags I use and toss. I’ve briefly tried rinsing/saving the bags but they never seem to dry properly, storing them between uses is a hassle and I worry about bacteria growing between uses. Plus they inevitably start leaking after just a couple turns in the fridge.

I’d really like to cut this plastic waste from our lives. Does anyone have suggestions for alternative ways to freeze my vegetable stock?