Team Crafting:Basic idea is to get a group of 6 from your guild and each one of you pick a profession, everything you pickup you mail off to the appropriate team members, Rune to the enchanters cloth/leather armor to clothiers etc. By doing this your bags stay empty since all you have to do is pop open your mail when you're full and send the items away to clear the space. Another variation to the is you can have 3 members each take 2 of the professions.
1)If pursuing this strategy you will definitely want to pickup the extraction skills in the crafting trees to get the most mats from extraction.
2)Please note that each mail you send off costs between 10-20 eso gold so costs are involved in this strategy but the benefits far outweigh them in my opinion.
To add to this you can create crafting guilds giving each team access to a 1000 slot bank to trade items between each other instead of having to mail everything. In order to achieve this you need 2 crafting teams of 6.
Crafting guild 1 would consist of the 6 members from team one who will have deposit/withdrawal rights to the Gbank and the 6 members from crafting team 2 to give you the required 10 members for a Gbank. Crafting team 2 would not have access to the this Gbank.
Crafting guild 2 would consist of the 6 members from team two who will have deposit/withdrawal rights to the Gbank and the 6 members from crafting team 1 to give you the required 10 members for a Gbank. Crafting team 2 would not have access to the this Gbank.