Unfortunately, vendors usually offer whole mixing kits for measuring by volume...which contain all sorts of things you don't even really
need. Many of us who mix by volume use just several syringes of varying capacities and some blunt needle tips. I can easily fit them all in 1 small Ziplock baggie. Have only needed to replace 5 cheap syringes in the last 3 1/2 years. Like many others...I make my eliquids right in the bottles they'll stay in, if they're 10-100mL sizes. Larger than that (like my ADV) gets made in a bigger bottle, and it's used to refill a 50mL bottle. It works for me and takes up minimal space.
Whether measuring by volume, or by weight though...the results can be the same = perfectly great tasting DIY. It's just a matter of personal preference as to which method someone chooses. I have no doubt that you'll do great measuring by weight!