Elastic loop at bottom of Grundéns kangaroo pocket? : r/whatisthisthing

Festo's BionicKangaroo gets the hop on energy-efficiency

W2C Moose Knuckles Windbreaker? [Link in 2nd picture] : r/FashionReps

Kangaroo-Inspired Jumping Robot with Controllable Takeoff

Black thing that can stretch the top part with the keychain thing : r/ whatisthisthing

For the identification of mysterious objects

Shrink Wrap with Kangaroo - #18 by DanielPiker - Kangaroo - McNeel Forum

Science reveals not all kangaroos hopped - Discover Wildlife

BionicKangaroo made by Festo actually looks like a Kangaroo.

Solid Collision Problem - Kangaroo - McNeel Forum