What summoning level are you? You have you're beast of burdens. AKA BoB's. These will allow you to carry more stuff when needed, either on the way, or on the way back. Obvious examples are camping green/all dragons, god wars dungeon and some skills like training prayer and gathering (mining etc.) Then you have healing familiars which, well, heal you. Some more than others and the amount they heal greatly increases with level. Always use the bet healing familiar you can when using one (except titan's as they are pretty expensive to use casually) The next set of familiars are the fighting ones which are rarely used till level 90 + (except of course titans.) Finally you have the stat boosting familiars and interact familiars. These will help you with skills such as hunter (artic bear) and mining (Golem). The teleports of the Kyatt and Grahkk familiars can take you to the clostest summoning obelisk and nature altar respectively. If there's anything I've missed out please query.