Backpack for new gear.

Hey guys and gals. I recently acquired some new gear, including 2 large lenses, and therefore need a new back pack for the times I want to take everything. Usually I will split and only take what I need for the situation but on trips it would be nice to take everything and even an overnight set of clothes in one bag. I live in San Luis Obispo, CA and there are no large stores here to sample a bunch of bags so I am turning to the community here. I am currently able to stuff my body and all my glass into a Tamrac Expedition 5, however it is bursting at the seems and It will not accommodate anything more so no change of clothes or snacks or anymore lenses etc. I would like to be able to pack the following gear:

Have
-Canon 80D
-Canon 17-55 f2.8 is USM
-Canon 100mm f2.8 L USM Macro
-Canon 70-200mm f2.8 is L III
-Canon 100-400mm L II
-2 Canon Speedlites
-Attachment for Tripod

I will eventually get
-Wide Angle (Suggestions?)
-35mm Prime (not sure which)
-Canon Ring flash


-Change of clothes???????
-Snacks?????

Please give me any suggestions you may have. Thank you in advance.

Other than a true trekking backpack my only suggestion would be something like the F-stop Tilopa BC and Sartori (now Sukha) .

My standard recommendation for bag sizing is to go to the LowePro "bagfinder" and build a virtual bag with the equipment you intend to carry. That will give you the LowePro recommended bags and even if you chose not to go the LowePro route, you can use the sizes as a guide in selecting another brand. I'm partial to LowePro by the way, they have served me very well for close to 40 years.

You can find the bagfinder at https://bagfinder.lowe​pro.com/lp/choose-profile.