Interested in something like these.. do they not sag rather once you start weighing them down with tools, drinks etc.
No not really. My standard carry would be a 750ml bottle, some snacks (gels in the thigh pockets), phone, tubeless repair kit, multitool and pump. You notice it’s there when you first load up, but I find it infinitely easier to forget about than a backpack. The glory of the bibs is that the pockets are held from the top and bottom, so they are held more securely than just a vest.
what happens when you crash wearing all these tools/bottles etc
I’m interested in ditching the pack but slightly nervous too as i’m prone to teh odd digger or 2!
I don’t see it as being much different to wearing a camelbak, except I’m less likely to carry unneccesary stuff that makes the pack bulkier than it should be. If I was to land fully on the bottle then it’s likely to deform, the top to pop off, and for me to get a soaking to add to the joy of the crash itself.