Is the Weck glass jar worth it for sourdough starter and canning?

Weck's whole design starts with the lid being its own piece, not threaded onto the jar. The glass lid, a rubber gasket, and two stainless steel clips work as three separate parts instead of one screwed cap, and that changes how you use the jar day to day. The wide, straight-sided tulip mouth means you can get a full hand in to feed a starter, scrape down the sides, or stir without wrestling a spoon through a bottleneck. Pop the clips off and the gasket peels away clean, so washing, by hand or in the dishwasher, never means digging gunk out of a screw thread. The tradeoff is that seal: it's a gasket press-fit, not a vacuum lock, so it's built to let a little air move rather than hold a hard seal for months, which is exactly right for an active starter that needs to breathe, and less ideal if you want a shelf-stable long-term seal for dry pulses. The thick glass handles hot liquid and a spin in the microwave without protest, so one jar goes from stovetop pour to fridge to counter without a second jar in between.