Mole
Thru Hiker
Sounds like half a Bivi to me.
MYOG High sided bathtub groundsheet
- Thread starter Teepee
- Start date
TinTin
Thru Hiker
Good ideas @TeepeeThe maximum potential height of the sides in my shelter is limited. Any higher and condensation may run down, hit the tub perimeter and pool inside.
It is a bathtub though.
I've often thought of trying higher..it seems as though deminishing returns would be seen as it get progressively higher. Maybe angling the sides inwards is the way to go. Undoubtedly though, higher sides would stop more wind; especially when used alone
FWIW, I have a another run of these to do and want to do a modular approach where I can switch a bug net top for a bivy top, or a combo of both.
I put a removable bug net on it last summer, which really held the sides up very well.
Inner optimism by turnerminator, on Flickr
This one is still my best 'tub ever. It's kept me bone dry and comfy in the tent for hundreds of nights now. That cover at the bottom has stopped everything from getting kicked out at night and has kept my feet warm.
I'm thinking for inside the Cricket and rather than have the corners held up by the corner guys like in your pic, I'm thinking have them partly held up to the little rings/mitten hooks. That would allow them to be a bit higher. Also, as you suggest, angling the sides inwards would be the way to go. I'm thinking about modifying a 3FUL bathtub. I might get a bigger one to give me the material tp do what I'm thinking. I've already bought some UL breathable fabric to make a foot box having been taken by your idea for that. I'll post pics if and when I get around to it.
I don’t think I’m the only one that would be very interested in a few pictures of the corner making process.
TinTin
Thru Hiker
Exactly! All the benefits of a bivi, more breathable and NO ZIPS!
Mole
Thru Hiker
I'm not sure that in many conditions, that having higher sides of non breathable fabric sloping in against your foot end is going to be a more breathable footbox. Sounds like a recipe for condensation .
My old Titanium Goat Bivi often had condensation in the foot area. That's the main reason why I stopped using it in cold weather. ( And access, as you have found).
TinTin
Thru Hiker
Getting the balance right will no doubt be an issue. It needs to be high enough to reduce draughts, far away enough from the fly so that condensation doesn't run down and the bit with the breathable top needs to be short enough to protect the footbox without condensation being an issue. I'm just thinking at the moment. I saw @Teepee 's comment somewhere else that a high sided bathtub had worked well for him and it got me thinking.
My issue with bivis is unziping and ziping yourself in, in the middle of the night when I get out for a pee. I'm getting towards mid 60s it is an issue!
Teepee
Thru Hiker
If your feet touch the outer of the bivi, then maybe it could cause some condensation . These tubs are much longer than the user (me) though, and feet hardly ever even touch the bottom. What annoys me about bivy bags/zipped sleeping bag cover types is;
Lack of airflow means moisture builds up.
Zips.
Getting in/out.
Putting your kit inside is really uncomfortable.
The top waterproof layer is wasted under a shelter
Is it half a bivy? Yes, sometimes...the best bit.
The waterproof bottom that stops your kit from getting wet from the floor and keep everything dry inside, whilst not being a pain to use and doesn't slowly dampen everything.I suppose you could call it a bugnet hammock nappy, too.
OM'r 2.0 by turnerminator, on Flickr
Mole
Thru Hiker
If your feet touch the outer of the bivi, then maybe it could cause some condensation . These tubs are much longer than the user (me) though, and feet hardly ever even touch the bottom. What annoys me about bivy bags/zipped sleeping bag cover types is;
Lack of airflow means moisture builds up.
Zips.
Getting in/out.
Putting your kit inside is really uncomfortable.
The top waterproof layer is wasted under a shelter
Is it half a bivy? Yes, sometimes...the best bit.
I suppose you could call it a bugnet hammock nappy, too.
Yeah. I agree. I hardly ever use a Bivi in single skin shelters either.
I was really replying to Phil's suggestion of going even higher and sloping inwards ( so closer and probably losing tight upper edges in doing so as hard to keep the strut corners firm if they sloping inwards)
Tartanferret
Thru Hiker
TinTin
Thru Hiker
What height are those sides please? @TeepeeThe maximum potential height of the sides in my shelter is limited. Any higher and condensation may run down, hit the tub perimeter and pool inside.
It is a bathtub though.
I've often thought of trying higher..it seems as though deminishing returns would be seen as it get progressively higher. Maybe angling the sides inwards is the way to go. Undoubtedly though, higher sides would stop more wind; especially when used alone
FWIW, I have a another run of these to do and want to do a modular approach where I can switch a bug net top for a bivy top, or a combo of both.
I put a removable bug net on it last summer, which really held the sides up very well.
This one is still my best 'tub ever. It's kept me bone dry and comfy in the tent for hundreds of nights now. That cover at the bottom has stopped everything from getting kicked out at night and has kept my feet warm.
Last edited: