Agree, tried it with low expectations. OK for a week or two then the vase split. I keep odd potential liners, shampoo bottles and suchlike, in a variety of sizes, no need to buy anything. Plastic has the advantage that you can cut it to height.
It does constrain the design a bit, but if you want a narrow neck you can either drill from top and use a plastic test tube as a specimen vase, or hollow from the bottom up to the taper, insert liner from below and glue in a disc made from the same blank. Once the bottom is finished you will never know.