Metallized Polyester Film Capacitors also known as Greenies. Low values/voltages are small in size but higher values/voltages can get a little big for tight places.

.001µF - 100v, 5mm x 9mm x 2mm, 0.1 inch lead spacing, Marking 102
.01µF - 100v, 6mm x 9mm x 2.5, 0.16/4.3mm lead spacing, Marking 103
.022uF - 100v, 7mm x 10mm x3.5mm, 5mm/0.2 lead spacing, Marking 223