I have one of this type of 30mL bottles. Although the tips don't mix with the others, they are still nice because you can sit them upside down over a receptacle and it's easier to get every last golden drop of nectar to come out of the bottle, more so than a narrow neck LDPE like you can get from China or the needle tip type bottles that go from neck to completely flat top. If these are like the one I have with the white cap, the neck and tip are much larger than the 15mL bottle. If you don't like filling from the big bottle or carrying it around, you can always put some in a smaller bottle for carry around.