code/__DEFINES/inventory_sizes.dm

ITEM_SIZE_TINY	Usually items smaller then a human hand, (e.g. playing cards, lighter, scalpel, coins/holochips)
ITEM_SIZE_SMALL	Pockets can hold small and tiny items, (e.g. flashlight, multitool, grenades, GPS device)
ITEM_SIZE_NORMAL	Standard backpacks can carry tiny, small & normal items, (e.g. fire extinguisher, stun baton, gas mask, metal sheets)
ITEM_SIZE_BULKY	Items that can be wielded or equipped, (e.g. defibrillator, backpack, space suits)
ITEM_SIZE_HUGE	Usually represents objects that require two hands to operate, (e.g. shotgun, two-handed melee weapons)
ITEM_SIZE_GARGANTUAN	Essentially means it cannot be picked up or placed in an inventory, (e.g. mech parts, safe)
ITEM_SIZE_COLOSSAL	For something large which takes an entire tile, (e.g. a full glass window, or a girder)
ITEM_SIZE_TITANIC	Something so large that it extends beyond the confines of its tile, (e.g. scrap beacon)

Define Details

Items that can be wielded or equipped, (e.g. defibrillator, backpack, space suits)

For something large which takes an entire tile, (e.g. a full glass window, or a girder)

Essentially means it cannot be picked up or placed in an inventory, (e.g. mech parts, safe)

Usually represents objects that require two hands to operate, (e.g. shotgun, two-handed melee weapons)

Standard backpacks can carry tiny, small & normal items, (e.g. fire extinguisher, stun baton, gas mask, metal sheets)

Pockets can hold small and tiny items, (e.g. flashlight, multitool, grenades, GPS device)

Usually items smaller then a human hand, (e.g. playing cards, lighter, scalpel, coins/holochips)

Something so large that it extends beyond the confines of its tile, (e.g. scrap beacon)