If you're ready to move to all grain brewing but don't want to purchase more costly and bulky equipment, you owe it to yourself to give Brew in a Bag (BIAB) a go. If you've steeped speciality grains in a bag, you can move to steeping (AKA mashing) your entire grain bill in the giant Brewmaster's mesh filter bag. When you're done mashing, lift and rest the bag on the sturdy stainless steel strainer to drain (AKA lauter). Then you're ready to boil your wort as you would with any extract brew.
The Brew in a Bag method is a technique that combines all the steps of all grain brewing into one vessel, saving on time, floor space and expense. It's been garnering a lot of attention in homebrewing circles, with some high-profile writers and bloggers advocating a move to brew in the bag, even after years brewing with conventional setups.