If anyone was interested, I’ve found that this pitcher is actually quite a good pitcher. I happened to have two on hand from a previous purchase (I bought them at Walmart years ago I believe). They are BPA free and actually seal pretty tightly. I do put my fingers over the lid when shaking vigorously, but haven’t actually noticed it trying to come loose at all. I don’t get leaks or soylent spraying across the room and it cleans up really easily in the dishwasher. It is also really wide so pouring gallon bags of DIY into it is really easy, and if needed, putting a whisk or spatula into it to get pesky bottom clinging powder to come free is really easy. Also, given that it is a full gallon, it is really easy to shake up even a full pitcher of soylent because it generally only comes to half full (or slightly more) so it has a lot of room to move.
As a plus, even paying for shipping, it is still significantly cheaper than the one that ships with Soylent orders (but I think Walmart still carries it in stores. I generally go to Target, but I haven’t seen it there). The only downside being that it takes up more fridge space and while I think it should be okay to store on its side (to increase the settling area to make remixing easier) I haven’t tried that, and I could definitely believe it might leak out over time. However because the bottom area is so large, I haven’t found it to be at all difficult to get the sediment off the bottom with just a good shaking.