Capsule (Super Smash Bros.)
From the Super Mario Wiki
Capsules are pink and white containers in all four games of the Super Smash Bros. series. They are light, and are easily carried and thrown by all the game's characters. A capsule contains one item. The size of the object doesn't seem to matter, as all sizes of objects, from baseball bats to hammers can be found within them. Alternatively, there is a 12.5% chance (1 in 8) that the capsule will explode when contact with the ground or another character is made, causing damage comparable to that of a Bob-omb.
In the Developer Direct video for Super Smash Bros. for Wii U, it was shown that the Capsules retained their original design from the previous Super Smash Bros. games. However, it was later shown in a Miiverse announcement by Masahiro Sakurai that they have received a slight redesign, being shorter and wider.
Super Smash Bros. Melee
Super Smash Bros. Brawl
Super Smash Bros. for Nintendo 3DS / Wii U