Particularly among players at the early stages of learning to play low whistles, the weight of an instrument can be a talking point. It should be said whistles are generally the lightest woodwind instruments, with a typical low D weighing around 180-250 grams.
For interests sake here is a table comparing the weight of woodwind instruments. Some of the heavier woodwinds do make use of a neck strap. The lightest woodwind to sometimes make use of a neck strap is the clarinet which typically weighs around 0.8 kgs or 1.7 lbs. Many heavier woodwinds though, don’t have much opportunity for additional support. A Trombone, which is typically ten times heavier than a low D, has no opportunity for additional support.
mk Pro D – 240 grams / 0.5 lbs
mk Midgie High D – 63 grams / 0.13 lbs
Overton low D – 190 grams / 0.4 lbs
Typical wooden flute – 560 grams / 1.2 lbs
*Clarinet – 800 grams / 1.7 lbs
Typical silver flute – 440 grams
**Typical Alto Saxophone – 2.5 kgs
Trombone – 2.7 kgs / 6.1lbs
Tuba 15.8 kgs / 35 lbs
* Sometimes used with a neck strap
** Typically used with a neck strap