Spouse was eyeball-deep into some computer issue or another, and I needed to get the big vat of chicken stock put away stat. We had decided not to can this time, but to freeze instead. I pulled out a box of quart-sized freezer bags, and was stopped short - how the heck was I gonna get the stock into the baggies all by myself without a huge, complicated mess? I needed some way to keep the baggie open so I could pour the stock inside.
Not sure what exactly created the "Eureka!" moment, but here's the outcome: a 44-ounce plastic soda cup from the local gas station will quite handily hold open a quart-sized freezer baggie, without need for clips or other manipulation. The "how to":
1. Have the 44-ounce cup and quart-sized freezer baggies ready. Check!
2. With clean hand, push the bottom of the baggie into the cup.
3. Example of what the baggie will look like in the cup...
4. Fill with whatever you're processing. Here's a 16-ounce measure cup pouring stock, for a total of four cups of liquid.
Due to being made of thicker plastic, the freezer baggie held up easily without assistance, even while being filled with liquid. I don't know if a thinner sandwich baggie would hold up as well, but maybe one could try using a paper/binder clip of some sort to hold one side (or more) of a baggie to the rim of the cup. I could see this technique being used for any type of filling needs - liquids, solids, etc. Anyhow, though I'm sure someone on the interwebs has to have already thought of and posted this idea, this was the first time the idea occurred to me, and it worked so well I'm passing it on to you. Hope you find it useful, too!