A 10 g pile of electrolyte powder is quite small compared to the 1 gal of water it is meant to be mixed into. You can visualize the powder as a mound 2.1 in (5.33 cm) wide and 0.881 in (2.24 cm) tall, while the water fills a glass 6.52 in (16.6 cm) wide and 8.15 in (20.7 cm) tall.

Biggest vs smallest
3.88× the size
1 gal of water vs 10 g of electrolyte powder
Typical adult or standard sizes; real ones vary.