These were originally designed as hero assets (stuff you'll see up close, typically through cinematics) so the polycount might be a bit higher than you'd expect, but they are also used for gameplay.
All of the gear is based on real-world items, with changes to make them unique to the world of Red Rabbit.
Red's Backpack is based on real-life wildland firefighter gear, while Rabbit's sling pack is based on its namesake with additions made. Batons are based on airport safety wands. While they are similar looking have some subtle, unique features to tell them apart. The paintball gun is based on the generic look you'd expect from one, not based on any particular model. Also modified appropriately for the character's needs. The silver CO2 can is a clean version of what you see already attached to the gun.