Planning a hike proposal is amazing, but a bulky traditional velvet box will awkwardly bulge out of shorts, hiking pants, or a backpack hip pocket. Several brands and independent makers design ultra-slim, pocket-flat ring boxes explicitly for this reason:
Known as the original slim ring case, it is wallet-shaped and roughly the thickness of a few credit cards, designed to slide seamlessly into any pocket without a trace. You can purchase it directly via the Clifton Engagement Ring Case Shop.
The Box Sock - They make specialized pocket accessories and a dedicated The Box Sock Thin Proposal Ring Box that has a smooth, slim rectangular profile built to stay hidden.
Soulmatebox - Offers a Soulmatebox Super Slim Flat Blue Ring Box (also available via their Etsy - Soulmatebox Listing ) that is leather-lined and flattens out in a pocket while accommodating decent-sized stones.
Etsy Woodworkers - Independent artisans on Etsy (search for terms like "slim wooden rotating ring box" or "flat pocket ring box for proposal" like this Etsy -
AvocadoWoodGift Proposal Box ) sell minimalist wooden swivel/rotating boxes made of walnut or maple that have a low, curved profile ideal for an outdoor or nature-themed proposal.
Exodus Goldsmiths - Offers a minimalist Exodus Goldsmiths Mini Invisible Ring Box that lies nearly flat and flush inside a pocket.[1][2][3][4]
Other Hikers' Experiences
People who have gone the outdoor route often emphasize testing out the pocket logistics beforehand so you aren't fidgeting with a stiff case on the trail.
I had a slim box that slid right into my pocket. Definitely practice taking it out smoothly a few times beforehand so you aren't fumbling while trying to hold her hand!
Do you know what kind of terrain or weather you'll be hiking through, or if you need a box with a secure snap/magnetic lock so it doesn't pop open on a steep climb?