I just got back from a 5 day trip to Yosemite which doubled as a family reunion. I was amazed that I was able to pack all my things into my Synapse, Side Effect, and Large Shop Bag. I did also take a Swift that was packed with a knitting project to show my mom and another knitted slipper project.
The Side Effect proved to be most useful. I kept my room key, lip balm, cell phone, coffee/tea tickets, receipts, keys, Cork wallet, Yosemite Valley Shuttle Map, an 8.5 x 11.5 paper folded in fourths, and pen in it and wore it with the strap (never used the fanny pack option).
When we went out for our daily outing, I also brought my Synapse with the Tall Stuff Sack (Iím knitting slippers), an insulated 12 oz Kleen Kanteen, snacks, extra jacket, and sunglasses. This way, I was never without my knitting, and had plenty of room to carry extra stuff (had 6 kids ages 2-13 with us), and was able to carry everything comfortably for hours. I could have put the Side Effect into the Synapse as well, but it was so handy to be able to access what I needed in an instant.
Synapse and Side Effect at Lower Yosemite Falls Shuttle Stop
L to R: Azalea Swift, Cardinal LS (my mom's), Plum Side Effect, Tall UV Stuff Sack, Black/UV Synapse, Large UV Shop Bag