armor shards - sentry packs (1 shard = 1 sentry)
energy armor - trailbreaker's shield unit (not sure of the properties yet)
stimpacks - jetpack fuel canisters (1 unit = 5 or 10 seconds of flight)
silencer - jetpack
bandolier - holograms (this'll be Hound's projector unit, I think once you
pick this up, you should be able to create holograms until your death. 
 ***note you can only have one hologram out at a time***)
heavy pack - invisibility
underwater breather - ?
enviro suit - ?
super adrenaline - Brawn
mega-health - ratchet (same thing probably, just a new icon)
quad - auto/decep symbol (heh, finally one that's done)
invulnrability - matrix
first aid kits - energy rods (same function)
medkits - energon cubes (same function)